I have a 3rd gen focus solo and it works very well!
Then i have an old Alva nanoface that works very well on windows. The drivers doesn't exist for linux, i contacted the support and asking for some source code (even if i have no idea how to recompile in case for linux). The alva nanoface, RME babyface clone is real good card with great input and HI-z input for guitar and bass.
Have you ever used the Alva and tried to use in linux.
I've only found this: nut it's not a driver porting in linux.