I purchased one of these on a lark because I always thought they were rather "cool" and interesting looking. For a long time I was turned off by the 32" scale, thinking that would be a downer compared to playing a 34" scale. Was I ever wrong!
This is the first 4 string bass I ever played I liked. Partly because, well, it really does not come in a fiver unless you get the Key Factor 5, which is really a different animal.
Anyway, as I have noted on some forum posts, the Ex factor is an incredible instrument. I've played no bass that was easier to play while sitting down practicing. It just folds into your body.
Sound-wise (I have both a FCS & non-FCS), they just sound excellent. If anything I think I prefer the FCS personally. a lot of people make a big deal over this distinction, but having both I would say that, really, it's not that great and scoring a used one in great condition is more important that the 9v or 18v electronics. And if it bothers you that bad, you can update the guts for a few hundred from Kubicki via Mike Haney.
Having been thru a lot of basses to find those that I really enjoy playing, I would rate the Ex Factor as possibly the last or 2nd to last bass I would part with out of roughly 6 basses I own.
In parting, I believe Phil Kubicki was a true genius. From the "flip" D-tuner, to the body shape, to the smooth tuners, and the laminated neck -- this is a bass that today clearly stands the test of time.
Kubicki Ex - Factor
If you would like to "D" tune your "E" string almost instantaneously, without changing string tension and not having to transpose, then the Ex Factor