IME, the synths are quite varied and flexible, with a lot of tweakable parameters. However, even after adjusting the sensitivity, it it quite tricky to control. Unless you damp well, the triggering can go nuts if it senses more than one note or harmonic overtones.
The modulation effects such as chorus, phase/flanger and the delay/reverb effects are great. Full and lush, with detail and again very tweakable. The EQ is also very flexible and useful. Everything in the unit is just so damn tweakable. Many people say this makes it hard to programme, but once you learn the system, it makes if very easy to get exactly the sounds you want.
The weak points however (very weak in my opinion) are the amp sims and OD/dist models. At clean setting the amp sims are passable and usable, but push them into overdrive and it sounds very artificial like digital clipping with no warmth or natural tube-like quality. The same goes for the OD models, it's impossible to get a natural, warm sounding gentle overdrive from this unit (anyone who says it can obviously hasn't experienced decent overdrive before). The distortions and fuzzes aren't so bad as the saturation masks the inadequacies, but it still sound artificial and lifeless, with no "bite".
I'm not all that keen on the compression either, they seem to colour the tone too much. Other people have had more luck with this section (Bongo for instance), but I just can't get any of the 4 compressors to sound quite right.
By all means check one out if synths and mod/delay effects are high on the agenda. But if it's distortion you're after I wouldn't bother.
