I've installed v7 two weeks ago and it works fine for me, but.. I installed it on my desktop. Soundcard works fine with VoodooHDA, which is installed by default (my soundcard is an Realtek ALC888)
About the videocard, I had an ATI X1550, it's only works in a good way after i've installed natit.kext, before this I just get 1024X768 resolution. After install the kext, I can change display resolution but without QE/CI.
A clue for you is: take a look on wiki, on HCL part you'll find a lot compatible hardware and a link to third parties drivers, which could be usefull to find compatible kexts for your hardware.
I hope it help you.
good luck =)