I bought a Firewire solo, but I haven't used it yet. I got it for entirely different purposes. Mine is to use for speaker measurements given its built in mic pre. The firewire cards were supposedly much more robust than usb when working with measurement packages.
I did read a lot of great comments about how robust and gliche free they were compared to USB cards. I have no idea how it would work in your application but you have a pretty good chance it will. Buy from newegg, try it out and if it doesn't work you can always send it back.