The Winfast card isn't actually a graphics card, it's just an additional processor to aid video processing. To my knowledge, it's the first of it's kind.
I can't find anything on an 'intensity pro' other than a Blackmagic capture card, which is unrelated to the Winfast card.
The Winfast card will signifcantly speed up your rendering times:http://www.bjorn3d.com/read.php?cID=1590&pageID=7086
And is pretty worth it's money, even if for heavy home use. If you're just doing light things, you may want to overlook it. If you go that route, I'd get a cheap but capable CUDA card from nvidia. You can get a GTX 260 for around the same price, and there are cheaper options.