Used for more than two years is a footswitch for Line 6 amp (mostly?). It allows thanks 2 switches to spend his right one on the left on the amp. Example: I am on the "clean" channel and I want to pass on the "crunch", I press the right switch. But to go from clean Metal, I have to press 2 times, so it is impractical.
In addition, there is a time for change channel, although Superior Marshall or Mesa footswitch (or any other) for example. This is a Gnant strand.
After, to change channels on a spider, I think we have no other choice but to go by if you do not want to change the hand (which I admit is when m I still less convenient.
Conclusion: not great but ...