It's fine. I've had it for a week. It may not kill the flies, but it knocks them down and then you can easily kill them.

The sparks are a bit scary, and if you don't persist in pressing the button for a while, the mosquito simply falls down and doesn't die!

It does its job well. I had a similar (older model) and I was hoping that I could use the battery that unscrews from the old model but it doesn't fit.....

It works well for the month that I have had it. It arrived in very poor packaging, resulting in it being broken in one spot, but since it still functions, I kept it. The plug is in a strange position, causing it to not be able to stand while charging.

The best thing ever! I've had it for 3 years! It has saved us during the summer... With a good 3-4 hour charge, I easily kill mosquitoes, flies, wasps, cockroaches, and any other annoying insect. Yes, kids, I even kill cockroaches. As soon as it touches them, they get roasted and smoke comes out! Just make sure to charge it properly, don't go trying to kill insects without a good charge because it will bite you. I recommend it 100%, it will save your hands

Good tool for the job it does, the only problem was that it arrived a bit broken on the racket, but since it works, I didn't bother to change it.

It does the job much better than I expected it to do.
In old age, you learn to play tennis by killing flies...!