You are really spending your money on such an uncertain thing? Well, that is either courageous or ... well, foolish
Indeed the manual says something about
"Operating System: Windows XP, Windows 7 and Linux" but reading shows limited Windows support (Vista not mentioned, not that Vista would be good for anything...), no BluRay for XP and Linux was mentioned with x86 (so probably no amd64 support).
99,9 % of the pages show Windows procedures and problems. "Linux" is just mentioned 2 times without any further hint. X.org or something not at all.
It's your money, I wish you luck but I am sure that you'll find out the many issues soon.
And I wouldn't spend any money on VIA anymore. Just had years of pain with their stuff (well, mainly the GPU side, the rest was so-so) I'll stay away from them.
I will PERSONALLY get 2 of them, one for Windows HTPC usage and the other to stick into a minix 780G running Ubuntu and see if the card's driver issues throttle me. Wish me luck.
If you are happy with one driver update per 12 months, don't upgrade your distro ever and don't care about 3d graphics then why not? Please blog/post about your experience, it will help others make more informed decisions - one way or another.
Who in their right mind would ever buy a discrete video card from VIA (or S3 for that matter) regardless of their OS choice? I understand some people might get stuck with an onboard chipset and have to make do, but to actually consciously decide to buy a discrete card from VIA just boggles my mind. I don't even care what the price may be when there are discrete cards from both AMD and nVidia in the $50 range that are at least as powerful and certainly far better supported.
How does power consumption of VIA cards compare to NVIDIA/ATI?