I just tried a few of these on a project I've had sitting around for a while (wondering how to finish it) and I do like the convenience. Drag-n-drop, adjust a knob here and there. Very nice! Takes all the mystery out of getting a decent sound out of an amp.
When I played onstage back in the 70s and 80s, I had a Roland JC-120 and the only sound it had was clean. It's only amp I ever owned, so I never got the hang of all that knob fiddling. This collection makes it _so_ easy.