I dont have much time during the weeks so I have not read much into pathfinder it seems interesting but from what i read on classes they seem a little overpowered, take the sorcerer, in 3.5 if i gave a sorcerer a bloodline without making her envest levels into it, it would raise her CR without actually raising her level. how does it justify say a level 10 sorc that really plays like a 12. and i really dont like the unlimited cantrips thing i would have to do away with that for sure. it can be abused way to easy. now understand my opinions are based on when i roll a PC for myself in a game i spend hours and i chose all my feats and skills wisely and my PCs play quite strong. I have not read into any other classes yet like I said not much time during the weeks, Tho I will certainly read into it more when time allows.
on a side note I personally have not read any of 4.0 tho some aspects of 3.5 were fixed i have heard far too many negative reviews, not to mention I have spent the last 5 years learning this system and am now finally very comfortable with it and the flaws i find with it i fix with house rules.