After 6 years of having it, it is the best investment I have made. With a dog with long hair that sheds every day, the vacuum works wonders. The only things I have changed are the wheels, costing 50 euros, and a set of extra parts to have for another 50 to 100 euros in consumables over the 6 years, which is nothing. The only thing you need is to have the cables gathered and organized in the house. It goes everywhere, cleans every day at 8:15 in the morning, a 110 sqm house, twice due to the dog, and it takes 1 hour and 16 minutes. Surely when its life ends, I will go for the newest model

Decent in cleaning but its navigation is mediocre, it bumps into furniture and gets stuck in certain areas. It is not suitable for large houses due to its mediocre navigation. I do not recommend it.

I had it for two years, but I gave it away because its battery only lasts for 50 minutes (at high speed) to clean a 90sqm space with furniture it takes about four hours and it constantly gets stuck on furniture, although it sucks well, I recommend the Xiaomi, it is much better. Also, it often gets stuck in certain areas and runs out of battery. Update 14-2-2020: I had given the vacuum cleaner to my parents, but it no longer works, it doesn't turn on, so I give it a one-star rating.

The 3rd Roomba that I buy and now I can write a helpful article!
Years ago, I bought the 500 series and I was satisfied (the crazy movement with circles still impresses me as it manages to clean the whole house).
The next year, I bought the next series (specifically the 650) and the truth is that it didn't have much difference from the old one.
Now, as an owner of the 980, the differences are chaotic and that's why it's worth the money it asks for and more.

Before I start, I want to inform you that the 980 and the 960 have the same technology but differ in three things.
1. In the battery. The 980 lasts for 120 minutes while the 960 lasts for 75 minutes.
2. The 980 has a turbo mode when it detects that it is on a carpet. (this significantly drains the battery)
3. In the packaging, the 980 has two headlights instead of one like the 960.

Positives for the 900 series:
+ It makes organized and logical movements, resulting in perfect cleaning every time and literally going everywhere compared to older models.
+ You can adjust the way and style you want it to clean.
+ The most important thing is that it is very easy and quick to clean. (The 800 and 900 series only have silicone brushes and do not collect hair like smaller models with bristle brushes.)
+ You can control it from your mobile with Wi-Fi (program it, check the cleanliness level of the bin, get notified when the bin is full, and it can show you step by step how to solve a problem, you can name it, see its battery percentage, the cleaning time or how long it will take to charge so it can start a new cleaning cycle manually with images and questions - answers for everything and much more. Really good job!)
+ You can see the map it has created on its own and see where it has passed or not.
+ It performs well on carpets!
+ It brakes before touching something with its specially designed bumper. (compared to older models that would crash into furniture and walls)
+ Women's and pet hair is a thing of the past and you can mop without finding hair in the mop.
+ You can pause its operation to, for example, answer the phone if it is next to you and resume when you want.

Negatives:
- The purchase price compared to the American market, which is 20% or even 50% less during specific promotional days.
- It can no longer clean properly at night like the older models did.
(The older models navigate with infrared, unlike the 900 series, which primarily navigates with the camera)
- The battery cannot clean a 140 square meter house with one charge, unlike the older models that could comfortably clean the entire house for 3 hours. (In case the battery runs out, it will go to charge and return on its own to the point where it left off.)

*A solution for the battery is to buy a larger capacity one, but you need to be careful about which battery you will get in order to avoid a message from the vacuum for the wrong battery (error 5).

Conclusion
It is a complete robot vacuum cleaner that is worth its money, as when you come home after work, you noticeably find a cleaner house. (Only when you try it, you will understand its work)
As for the money it requires, it is undoubtedly a large amount, but on the other hand, if you were paying a cleaner, it would cost you more.
With the robot vacuum, since it operates every day, you keep the dust level in your house at a very good level. Also, there is less dust on the furniture due to frequent cleaning. (Owner of a conventional vacuum cleaner that, although it cleaned well, was heavy and I practically didn't use it every day)

The best investment I have made recently! Very easy to use through a simple app (wi-fi).
It goes almost everywhere, there are very few places where it can't fit. The bin is easily replaceable.
With my 2 dogs, I empty it every 3 days.
As for the noise, in strong mode, it is loud, but in normal mode it is much quieter than a regular vacuum cleaner. Anyway, I turn it on when I'm away and I don't care.

I no longer use the vacuum unless it has a problem. After 5 years, it is still very good but expensive. With the offers I see, it is close to the price I bought it for back then. Now there are Chinese ones that are equally effective, either cheaper or better depending on what someone wants to pay. If you want to stick with iRobot and just a vacuum, prefer the iI7 on its own or with the automatic mopping system that can also work with the company's mop. The result will definitely be somewhat better, but the cost has increased significantly. I have now bought two other roborock ones that are both vacuums and mops, and I don't go back. Of course, the more functions there are, the more time one needs to have. You will have to empty the bin more frequently, wash the cloths for mopping one, two, or three times a day depending on usage and the degree of dirtiness of the floor.

It is an amazing tool, coming home to a clean house is undoubtedly a great help. It cleans all the spaces and corners well, and as for carpets, it does a very good job collecting a lot of hair from our three cats. For better results, it makes two passes in each area it cleans. It is the best available option right now, with the ability for remote operation, although I haven't set it up correctly yet because I don't have access to the work history and some other things. The only negative is its price, but you get what you pay for. It makes quite a bit of noise (like an electric vacuum cleaner) and the bin, at least for the size of our large house and the pets we have, needs to be emptied daily, as well as the air filter, which I shake and blow to remove the dust every two days. For each level of the house, it takes about 1 hour and 10 minutes for two passes and completes it without needing to recharge. As for how long it will last, I hope it lasts long enough, hence this brand choice.

After 2 years of continuous use, it works perfectly if handled carefully because it has many plastic and delicate parts. There is nothing that would make me mention it, except that the battery doesn't last as long as it did at the beginning.

After 3 years of daily use, it still works well and we continue to clean without any problems. I am waiting for the new version, i9+, which has 10dB less noise and larger brushes, and it is even more powerful than the 980