Xpantastic!

Reading up about the Chroma, I was surprised to find it uses 3372s and
3374s...  

The chroma allows for serial dual filtering which is intriguing, and
has a variety of filter modes, and also seems to do ok in the way of
modulation.  It also seems to have snappier envs from the demos I've
heard (tho I realize they are still software generated).  

But I also get the impression that its VCOs are ultra-stable due to
two forms of auto-tuning...  I don't think I would want anything more
stable than what the xpander offers now...  (or is this a moot point
given they both use the same chips?)  

I only played one briefly some time ago but am now potentially being
offered one for sale or, gasp, in exchange for my xpander!  So I am
wondering if anyone's used both and able to comment?  pluses/minuses?