I upgraded rc1 to rc3 directly with no issues, boot times is a bit faster, less timeouts during boot, dsmos arrives quicker, blackout to desktop faster, etc...

Geekbench 64 works perfect for me with RC3

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Acer 6936g 864G32mn [@ Snow Leopard 10.6.1 32/64bit
C2D 2,4Ghz 4Gb 1066mhz DDR3 9600m GT 512 GDDR3

___Snow Leopard tutorial -> http://www.infinitemac.com/f57/guide...ted-for-t4183/
_________Leopard tutorial ->http://www.infinitemac.com/f19/guide...-iatkos-t3357/