[LAU] multi-channel recording

I've been getting by so far with an amd64 box running debian, jack, ardour etc through Terratec DMX-6fire (Envy24 based) card, but now find that I need to record more channels simultaneously. I would like (and can just about afford) the M-Audio FastTrack Ultra, but it doesn't look as though it is going to be easy to get it to work under Linux. It's a USB 2.0 device - it needs those 480Mb/s to record 8 channels simultaneously - so it isn't class-compliant. Has anyone succeeded in getting this interface to work properly in Linux? If not, can anyone suggest alternatives in the same sort of price range? Thanks, Edward