I can't vouch for FCP or Motion, but I've moved all of the apps I used on my G5 such as the Creative Suite, QuarkXPress etc, over to my hack and they all work and perform as expected. The migration, for me, has been fairly transparent. Performance has been fantastic which obviously makes me very happy.

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MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB