I can't say anything about the OFF product. HOWEVER if mosquitos are bugging you ;-)) around your home, I do have a fix for that.
The mosquitos were horrible around our home. I put up and electric bug wacker around our home and nothing happened. I went down to a local butcher and asked for a small slice of beef liver. I asked the butcher for extra bloodto go with the liver.
I took the container of beef liver and blood and attached it to the bottom of my bug wacker (1/4 acre size). The next morning, I couldn't see the light in my bugwacker. It had attracted and killed so many mosquitos, their bodies had clogged the grid. I unplugged the bugwacker and washed out the mosiquitos. That night I plugged it in again. I did this for 14 days. Then my wife and kids and I were even able swim in our pool at night and not be bothered by mosquitos.
Good luck to you and yours.