I just converted over. In the SETI@Home newsletter, they mentioned that due to problems with simultaneous operation and migration of the database, they would not be migrating the full database over to the BOINC version until after December 15 (the conversion deadline for all prior users). Once all the users are converted, then they will update the new database with the old user workunits and credits. They better, otherwise my 15,148 workunits completed to date under the old system will disappear!
In the mean time, the BOINC version seems to be functioning very well, and cranking through workunits. I agree the user interface and display are not nearly as attractive as the older version, and the progress display leaves a lot to be desired. But since it is running when I am not using the computer, and presumably not paying attention to what is being displayed, I don’t really care that much.