I came from EOS 4 which became Katkiss, which had problems after development of EOS 4 was shut down. Had to do a factory reset to get this ROM to fully work though. Before the reset for example the calendar did not update (showed up empty and could not be fixed whatever I tried), and the system behaved funnily here and there.
With a clean install I have to say I'm very impressed. Everything is very fast and smooth. And Cyanogenmod is very polished, and there are a million options to tweak, although by default everything seems to work pretty ok.
One suggestion: the Reboot menu could have a Reboot to bootloader option, like in EOs 4 / Katkiss. How it works there: first you select Reboot, then from a second dialog/menu reboot or bootloader etc.