Stewart Platforms...

I've been lurking for quite some time, and read many a back
messages. It is at this point that I'm ready to ask: what about
stewart platforms, or less specific, parallel style CNC?

Here's the thing: I've read wide and far about the subject. I work
at a university, and have gone deep into the many issues around
paralell style machines, most specific the kinematics.

There are a few mentions of hexapod type machines, but no real
discussion. Having said that, I ask these questions:

Is any one using or exploring parallel type machines? If so, of what
type? 3-3? 6-6? And if you are, what type of software/hardware are
you using?

Thanks. I am seriously impressed with the amount of knowledge shared
on this forum. I have already learned a great quanity about CNC.