They are a neat little tool.
I got one because I found myself in the right place at the right time.
I have many methods that are capable of worry-free assembly/disassembly of the XMs, but the tool is designed to be the "proper" method.
Like any way you go about it, the tool can be awkward at first till you figure out how it works best in your hand and for your wants /needs.
I decided to get it, swap my scales fairly often as the mood hits, so I use it enough.