My only concern is with the cooling fan system. Currently it is set up thermostat style meaning it only runs when the unit reaches a certain temperature. I don't think that is a good design. The fan should run at all times. Why wait for the unit to get hot and run the risk of overheating and/or failure? That is my only gripe. Other than that, I love the weight (11lbs), size (fits in a latop bag), and the power output (250w@4ohms, 500w@2ohms)! Having said that, I think most Class D amps tend to run a little warm. If you do decide to go the Yamaha route, you'd better act quickly because they are being blown out and will all soon be gone. I don't think Yamaha has anything up their sleeves as far as a replacement or if they will even continue making bass amps/cabs. If I had one more gripe it would for the amp to put out that 500w into a 4ohm load and not 2ohms. Good thing is though, you could daisy chain 4 8ohm cabs if you wanted!