Somehow in my current setup I don't notice the breakup anymore, so the part of breaking up the sound could have been caused by some other component (cable,other pedal in chain). I'm using it ailt now together with a expression pedal. I have the harmonize function switched on most of the time, which gives a real vintage flavor. Not all the shapes have a se-case, but they are different enough to actually be used at some point, non of them sound bad.
**Not sure if it's a setting of the controls, but it easily distorts (not in nice way) with my hotter P90 pickups. I have to dial my guitar back to keep the clean sound I had without the pedal engaged and adjust the level, which is a bit of a hassle.**