I ran across a sonic blue one at GC over the weekend and thought it was pretty cool. I haven't owned a Mustang (or short scale) since my first bass when I was 12, and I totally dwarfed the thing! I overreached all the fingering positions and found myself playing right at the bridge on my right hand. With some practice, that would go away.
Anyhow, I thought it was pretty comfortable and I was surprised at how much I really loved all the tones! Like the video that was just posted, I found myself spending a lot of time in the bridge pickup position, which I surprising for me, as bridge single-cool sound is usually not my thing. Love the switch, love all three tones, and I adored the color scheme. I experienced no rattles, switch popping noises, etc. It was just a plain, fun bass.
The negatives: it does neck dive somewhat. I tested it on a leather strap which seemed to solve that issue. It is definitely noticeable when sitting. The other negatives were all setup related. The fret edges were razor blades and the pickup heights were really goofy.