How good are open source phones?

I was looking at the current Neo Free Runner as possibly my next phone as on paper it seems to have a lot of great features at a pretty good price - for a SIM-free handset.

However, the software stack seems fairly incomplete. Has anyone any experience of using one, or has any idea of the sort of time-frame within which the phone might become a touch more user friendly?

I've had a look on their website and it's a bit light on that sort of detail. There does seem to be Qtopia, but has anyone any experience of using it?