Finally got mine!
AMU 0: | 334.7M/328.5Mh/s | A:45 R:0 HW:1 U:5.44/m
It's actively cooled, and alone on a USB hub with two power sources. So I doubt you can do better regarding HW errors (unless the heatsink is really bad?).
Linux users with their own kernel setup should compile/load the
cp210x kernel module.
Not quite, there is no module requirement if you are mining with cgminer 3.2.1+ as it uses direct usb communication and will unload that module you just recommended.