Upgrade from Cubase 5 Studio and Yamaha MR816 FireWire?

I do see a lot of interesting information in this topic:

Seems like it may work indeed, but then again, with all people mentioning specifics about chipsets etc etc and still some people reporting it doesn’t work, dunno. I need to ponder whether I wanna give it a try. I just want to have a stable system, reliable, and future-proof.

With regards to my third question, how can I connect to the helpdesk? Does anyone know?