I was one of those that pre-ordered P5, and was horribly disappointed. So much so, that I put it back in the box, stuck with P4-Pro, and never took it back out of the box.

With that kind of disappointment, I decided not to buy P6 at all. (I'm still mad at Curious Labs)

From what I have been reading so far, P6 is still BETA, and not for me. The product should be stable; it's as simple as that.