Bests & Worsts Reviews from Amazon

When comparing models we didn't realize the professional version reviews were being included with the junior models. This is incredibly disappointing because my son used his birthday money to purchase a model that, as it turns out, is incredibly erratic and doesn't provide good results. It will beep for no apparent reason and then not beep when it's right over a metal screw. We adjusted the sensitivity and it started beeping at everything, and turned it down just a bit and it didn't beep at all. We're going to give it one more try and then look at how to return it if it still sucks.