Once this was done, I rsync'd 190GB to the fresh install (yes, my home directory is 190GB), and saw write throughput to the RAID50 set at around 100MB/s. Reads were slightly higher than that at 110MB/s. I've been beating up the 9650SE and the Ultra 40 M2 with my normal brand of workstation torture -- cyclic MD5 sums on multi-gigabit files, kernel recompilations, DVD ripping, MP3 encoding, and two virtual systems running under VMware Workstation 6, all while playing movies from NFS shares and running Beryl with all the widgets enabled. Between the stellar performance of the 9650SE and the calm and steady power of the Ultra 40 M2, all of these tasks were handled with aplomb. Suffice it to say, you'd be hard-pressed to equal or surpass the performance of this box with any computing hardware available today.
As far as longevity and survivability goes, the 9650SE has been running for a few months without a problem, and my several-year-old 9500 8-port SATA RAID controller has been driving a four-disk RAID5 set without a hiccup. If history is any indicator, reliability isn't an issue with 3Ware cards. I'll be posting more on this power duo as time and events warrant, but for right now, I'm a very happy guy.