I purchased one of these to use my JCM800 head so I could switch both channels and turn the reverb on or off. I've used various standard amp switchers in the past but always had problems with the cable failing or bemoaned the lack of LEDs. I've even modified a few with a jack socket so the cable life is prolonged by using a separate stereo cable. Still though I was never happy with the amount of space a standard 2 button switch takes up on my pedalboards. This little box is a godsend. It takes up only slightly more space than a standard sized MXR type pedal and should last a lifetime (most Boss products do in my experience). The housing is all metal also so should withstand plenty of abuse. A real bonus is that it is multi functional so I may find a separate use for it with keyboards or tap tempo as it can be switched from latching to non-latching. Only drawback for some people is that it needs a power supply. I have a few spare outlets on the one underneath my board so not a problem for me. Brilliantly designed, multi-function product which is long overdue on the market.
I purchased this product to use in conjunction with the new Boss RC3 Loop Station. The new functionality, where you can move back and forth through loops fairly quickly and easily using the A button (momentarily to move forward, and held down to move backwards through loops), is excellent compared to what I was used to using the FS5U and RC2. The reduced dimensions are excellent, and alongside the ability to power the footswitch via a standard Boss power supply (whereas the FS5U requires batteries), makes this product much more suitable for use in a fixed pedalboard.