Adaptec 32xx,31xx cards

Has anyone used the Adaptec IO2 (31xx, 32xx) series of raid cards? Any success/failure stories to tell?

I currently have RH7.2, lvm-1.0.3, 2.4.18-rc2, ext3, 8 disk sw raid5 across 2 - 29160 cards working fine. Just looking for hardware performance/reliability gains.

TIA

toby