Simply put, the one at our Target over the holidays had its 1P joystick get wonky, two buttons stop working, and the monitor suffer from burn-in within the three weeks they had it on display. Considering the cabinet had very little play (and not intense play, at that) and the staff turned off the unit when the section started dying down, it really doesn't speak for its quality.
Even $50 for that thing may be too much. It would probably be better spent towards wood for constructing your own cabinet.