I finally got a SSv3! Had the first gig with it last night using a Mojo, and had mixed results. Overall, it's a great product, and most of my observations are the common ones mentioned on this thread, but two other things stood out last night. The room was in a brewery, super reflective/echo-y, huge windows, no sound treatment anywhere. So keep in mind that the room was far from ideal.
The first thing was that the volume of individual notes in the bottom 2 octaves were uneven. for example, Bb and Eb were the same volume, but the Db in between was almost inaudible. I noticed this even with the width at 0, so I'm confused how this could happen.
The second thing was that it might not be loud enough for me. I was sitting about 6 ft away, so it had "room to bloom". When the band was really loud and I started to lose myself in the mix I had to really crank the volume to 4-5 o'clock and the amp started distorting! it was a weird sounding distortion though, maybe just a weird product of the room. I tried decreasing the Mojo volume, but that didn't help much, so I don't think the preamp was distorting.
A related observation was that the volume of the EP sounds changed dramatically when I switched on/off a stereo effect. Not a terrible thing, but something I'm really gonna have to watch out for.
Has anyone else noticed their SSv3 distorting at high volume?