I've got an alu 2012 frame. It is now at the point where it needs a good service, although i think it's the shock bushings rather than the pivot bearings.
As has been mentioned above, judging bearing wear is pretty subjective, but I've had no problems. It tends to be the bike of choice for weekends away, so between rides it gets left in the garage for weeks on end.
Riding wise, its done a week in PDS, a week in Molini, 4 rounds of the this year's UKGE series, regular days at Aston Hill, uplift at the FOD and Cwmcarn as well as plenty of wet welsh trail centre rides. It's been dunked in rivers to clean it, and not-very-carefully jetwashed a couple of times when the mud had properly dried on.
It's an awesome frame, and i'd have the carbon like a shot. The climbing traction is excellent, but it is very much in the AM/Mini DH category though, and it really shows when you ride it fast in the rough stuff, where it's very composed.
It takes some time to get the shock right. Mine has an RP23, which I found was really blowing through the travel on drops, which is best remedied with a plastic spacer that fits in the air can. I'm running a medium spacer in and it only pushes the 'O' ring off on bigger drops/flatter landings. the travel now has a great 'bottomless' feel about it.