I have the 5500 as well and have no problemss with it. I've heard in the past several people say the 5500 is unstable but I think that has been rectified. With all that said, your gunna pay lotz more $$$ for the 5500 then a VooDoo 3, which still works amazing fast compaired to Amiga classic video cards.
So, it really depends on if you NEED the high perfomance AND if you can/are willing to pay for it...
J-Golden