For guys with average hair, QB House is apparently great. My husband has very very thick hair, and they never manage to do a decent cut in the short amount of time you`re allotted there - in his case even if it`s a trim. It`s a set 10 minute cut, so if you typically take more than 10 minutes to get to a decent cut... You may be out of luck.
They`re great for frequent trims or minor corrections, but there is no way I could imagine using them as a main barber.