I've got an old Zoom 509 that I've had for more years than I care to think about... I think I probably bought off Noah. It's all plastic and at first sight might appear flimsy, but I've gigged the hell out of it and use it at home a lot as a headphone amp. It's taken a licking and keeps on ticking, as they say. No qualms whatsoever about their build quality. I'm using an MS-60B now and it's built like a bomb shelter. I would sooner buy Zoom gear than Boss, quite honestly.