Great idea, with great construction (as most Gravity stuff). However, the smallest clamp depth is still too much for many combo amps that tend to not be deep enough for the clamp to fit. For example, on a Boss Katana, the clamp is at least 6cm too deep, meaning you'd have to get a block of some kind to put between the clamp and the amp. Same thing would hold true for most Fender amps. Works like a charm on 412 and standard depth 212 cabs though.