fwiw "xilinx" is a vendor of programmable gate arrays. how "good" the part on the board is, is determined by how good the program it's running is.
The other major chip on the board looks like a Cypress EZ-USB interface.
My guess is that the musiland people took some notes from the other high resolution usb audio devices on the market and just configured the ez-usb chip to behave as though it's a standard usb audio device that happens to support some higher bandwidth modes -- this is how the M-Audio and Tascam devices work, at least.
Also, both of these chips don't have to be programmed at the factory - there's a fair chance that these are just so much digital playdough until the device driver uploads some firmware files.
So, since I use linux more often than windows, until i see an alsa driver for these, I'm not interested. plus i already have an m-audio transit anyhow.