I really like Prana clothing and I have several pair of their shorts which always fit great and a shirt of theirs.  I tried the Prana Zion due to the great reviews but after trying them on, I have to admit that I returned them.
Pro's:
1.  Great fabric
2.  lightweight, durable
Con's'
1.  I didn't like the slightly flared pant bottoms.  If anything, I want something more tapered, since trail gunk etc. will collect on the bottom of the pants.  These are, after all, a hiking pant...right?
2.  They designed these to roll up the pant bottom...but the more I thought about it, I never roll-up my pants and it just seemed like a feature that I'd never use.
3.  The 32 inch inseam seemed longer than other 32" pants that I have, and they were almost dragging on the ground for me, a big no-no.  I had to pull up the pants to keep them from dragging on the ground.  So either the fit and/or cut was not quite right.