OK, played 3 hours: mostly it rocks, had a minor bug right at the beginning where a sound glitched and kept repeating the moment a help tooltip popped up (indeed it was the sound of the pop up), but I resolved it by immediately restarting the game with help tips turned off. It has affected none of my experience.
The game system is pretty awesome. I love being able to hire (roll) new companions on the fly to try out builds I want to mess around with. I haven't seen all stats come into play, but the link in my op is totally obsolete: everything seems rebalanced and shifted around but Strength (more damage) and Intelligence (bigger AOE/duration) seem like clear favorites for almost every build.
My main character is a cypher which is a gish/psion/warlock/spellknife sorta thing: every hit creates a resource called focus you expend for spells, pretty neat and cool fluff around spells.
I also made a friend: a Chanter, really cool class, equal parts Bard and Necromancer: you sing songs of couplets and every three couplet you get a spell, often summoning: e.g. buff party, debuff enemey, debuff enemy and once the three are sung, summon three skeletons!
Really, really like it so far, worth every penny, Baldur's Gate 2 raised from the dead with no Con penalty, etc etc etc.