Still not having any issues, and I've got my 600 screwed back together and everything!
For those who have not bought this yet, I HIGHLY suggest it! The design is a thousand times better than the design of the 603, I didn't feel at any time like the parts were not meant to fit together, plus my Flicker Fixer has not came loose again which is also a plus!
The USB seems plenty fast for me, though I have no idea how fast it was before this card released.
All in all I really can not complain, I've got about $800 dumped into my humble little Amiga 600 and I'm loving it!!!!