Amazingly Flexible Unit, but don't expect plug and play
I bought this for the synth sounds (work in an 80s cover band and needed to be able to copy synth bass lines), but the COSM bass models and amp models are actually even more useful. With a change in patch I can cop a Music Man, a Jazz Bass, fretless on a fretted (sort of... in the mix it sounds find), all through a series of class amps.
The unit is non-trivial though... it can be rather complex in places, but as long as you invest a little time reading the manual, it's straightforward and consistent in it's interface. For me, using the PC editor is so much easier than the onboard controls, it's essentially a must-have (free download from Roland's site). The first notes at the first practice with the thing made the whole band go wow... which is pretty rare for a bass player (in my experience), so on that basis alone it's won a permanent place in my arsenal... but it's far more than glitter, it's a real tool.