imo 650i isn't a great chipset - you'll also find various complaints about pretty much every other 650i mobo if you look.
Unless you need SLI or loads of IDE devices I honestly feel that 965 is a better chipset. I've had an Asus P5N-E SLI since Dec. & it has plenty of flaws too.
As for the FP-IN9 SLI most people seem to find that it's perfectly solid at stock but doesn't currently overclock past the mid 400s (I personally suspect that it's the BIOS not allowing 1.6VMCH which other 650is seem to need for high fsb).