I'm moving directly from Retrospect 6 in Snow Leopard to Retrospect 9 in Lion. I love some of the new features, but am baffled by why the program is so slow while setting up a restore (click, beachball, click, beachball...). But once the script is running, it accesses data very quickly.
Looking at the big picture, I'm backing up (3) Macs to a hard disk set, performance is great, at around 2.2GB/min., small test restores have been fine. Cheers to the Retrospect team making this software great again!