I moved now from the old Firefox sync server to the new Firefox Accounts. I tried to install the new sync server for a week but it still won't run, mostly because I don't quite understand how it is supposed to work. The old server was one deamon which you would run, the new one seems to be about 5 or 6 different deamons you have to run at the same time. Some day I will move to my own server but for now Mozillas official one has to do the job.