Based on personal experience, I would stay away from M-Audio. I bought their ProFire 610 earlier, obviously manufacturer does not provide suitable drivers for it now, I managed to find several versions here & there which still had PPC support, but neither of them actually worked (they installed, some of them launched, device was recognized, but sound controls remained dead). I wrote to M-Audio support over e-mail and in Twitter, both have been ignored. Sold ProFire due to being unable to make it usable with G5.
This doesn't work, then?