I haven't tried booting yet because I don't have a spare SATA drive to play with. I haven't left the computer on for long periods of time but I haven't seen any kind of a crash yet...also since the PCB is different we can't be certain that everything will be fully compatible, but it seems OK so far.

The Sil3112 seems to be configurable for 120 ns or 240 ns flash chips according to its datasheet. I'd say 120 ns is safe to use...