actually it is not bad at all! I'm turning all possible knobs to see where is the limit, but it sounds good!
Of course, you can't expect the sheer power that for instance the MS20 which is on top of it can deliver, but I am
mainly interested in the sound morphing and motion functions, which are imho where the radias excels.
But it is too early for me to say anything, I have to study how does it work to make proper sounds 
in between all the "new things", I think that the Radias is some good stuff for the money you pay for it...
and then I am always searching for synths that treat sounds in the way that others can't...
Function wise, albeit in a total and more simplifed way, it shares more concepts with the Clavia G2X rather than a
classic modular synth, even if it has more the approach of the latter.
the only thing I dislike so far is the position of the connectors... it is ok if you use it with his keyboard or as a
table top synth, but if you rack it, you loose 1U on top 
an interesting tweaking here:
http://www.youtube.com/watch?v=XQ6pH4TCN8c