Rating: - Don't bother
I bought this for a mouse problem in an old rented house. Its a nice idea but it doesn't really work - the mice get used to the sound, even on 'irregular' setting and coverage is a massive problem as ANY object will block its field of view and create blind-spots behind it. Of coure, I was unable to tell if it helped prevent mice chewing through wires as it states, but I doubt it.
Rating: - An instant end to the ant invasion
I got a Pest-Stop 2000 ultrasonic/electromagnetic pest repeller about three years ago as I had a big problem with ants coming in to the house. I was sceptical, but the result was almost instant and I have never had more than the odd one or two ants in the house since then. Much safer and cleaner than using chemicals, and convenient to use too - you can plug it into any mains socket, and I easily found one that was never used for anything else. Highly recommended and well worth the money.
Rating: - problem not solved..
I bought this repeller for just under £36.00, and I am very disappointed with it. For the first few weeks, I did not see any mice around the house and I was very happy about it. However this morning, I saw a mouse about 30cm away from the repeller. I think somehow they learn to tolerate ultrasonic waves. Unfortunately this attractive device has not solved my problem.
Rating: - DON'T WASTE YOUR MONEY!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Honestly, I bought this as I've had a mice problem. I was hopeful but walked my front room today where the device has been plugged in for over a week to find a mouse on it. Happily standing on it. What a con.