Great idea! The Problem is with the trimming guides. They do not stay attached while in use. They fall off the trimming unit causing sudden scalping of the hair. If it happened at a barber, I would sue him. I can't sue myself for a terrible haircut, so I will wait for it to grow out. The company needs to create a more sturdy/fail-safe means of attachment of the guides to the unit itself. Great idea: poor performance. User's recommendation: do not purchase product under current design.