I have the same as CP but with the extra 3 speakers. They tend to last (or at least mine have) about 3 ~ 4 years... both occasions something has come unstuck in the sub and started rattling. But for about £40 for the 5.1 ones its kinda worth it. Decent quality and a nice sub. Don't really know how well they will work in a garage tbh, as you're talking about a long old room, with not so fantastic acoustic qualities. In a small room or area, they're fairly decent but imagine any larger and the bass will be lost.