I have found that when I have had issues with my Thunder 500s, it has been operator error. I HATE owning things that dont work properly and get rid of them when they dont. When I first bought mine, I have to admit that I was a little dissappointed and even a little frustrated. After doing my homework and reading the manual very closely, I have been nothing but pleased with my two units. Don't get me wrong, if you have the time and fresh birds to work with, then wingers are the way to go. Unfortunately, I have 30 minutes to train after getting home from work and the Thunder 500s are the only way to go in my opinion. I will continue to use mine and will look for a third unit in the spring to complete my training gear!
Matt