Firstly- this isn't properly isolated like some supplies so if you're running high-draw pedals like Strymons, you may run into noise issues. BUT - The battery option is really convenient. There are plenty of outputs, and it's small enough to mount under a pedalboard. As others have noted, the power switch can be awkward to reach, but you can get around that. Also the LEDs are really bright but you can turn them off or stick electrical tape over them, so no problems there. It is definitely one of the quieter power supplies I own, but the real plus point is the fact that it charges with a standard 9v centre -negative supply (of 2A or over). So if you were previously using a one-spot, you can use that to charge this up, which is really cool, especially if you aren't able to use the euro plug it comes with.