The switches on my Microtubes 500v2 are a bit too small to be operated while playing without risking making the wrong change. This footwsitch allows to tap into the full potential of the amp. Its size is perfect - not too bulky, but still big enough to avoid pressing two switches at the same time. Quite sturdy and great packaging. Only (minor) issue I have with it is that there are only blue LEDs on the channels, and my OCD mind would have liked to see them turn red as well to match the head when in B3K mode.