I've been using now my new CF-F9 with ubuntu 11.10 alternative install and I just love this combination. I even received additional memory (+4 GB) just before Xmas and even distributor warned me about it usefulness with windows (32 bit) - there is full memory available now to my 64 bit Linux. Way to go.
This computer is really solid for carry on usage and big screen makes things productive. Only thing which is not configured at this point is 3G connection with on-board Gobi2000 module. Firmware loading is pain under Linux (big thanks to Sierra Wireless!) and I even think to replace sierra wireless with some another module working without external loaded firmware. Maybe sony ericsson have a model for that.