I recently switched to FT for the rakeback and the bonus. I've cleared about 60 bucks of it after 6k hands of 25NL.
The rakeback is nice
In general, I had lots of problems at 10NL on FT because of people playing almost anything and being unable to put them on a hand. When I waited until I had a hand to play the maniacs it would always get cracked. The games are definitely more aggro at full tilt and I find it easier to get paid off. I also never have problems finding games with 60 percent of people to the flop and committing a lot of money.
The thing I find annoying about fulltilt is the software is slow and not quite as refined as stars. It just feels laggy to me.