It's working pretty well for me on 32bit Fedora (with the latest 2.12 test bitstream).
A couple of minor suggestions.
The rxtx library doesn't seem to recognise ttyACM ports. I'm creating a link to a ttyS port as a workaround, but I vaguely remember seeing a patch to add this support somewhere?
I can't get the UART analyser to run, it always gives an exception on real serial data.