I love my Bolt, but I haven't used the Bionic. If it was me, I'd hold off until the end of the year before I bought a new phone. Of course, if it's not gonna cost you anything, then sure, make the move. Be sure to get a bigger battery though. I use the extended battery and never worry about it during the day, but if you don't want to turn the phone into a brick, get the Rezound battery. If you plan on rooting, I have to think the Bolt has WAY more ROMs to play with. However, if you're not going to root, going from the Bionic to the Bolt just seems like a lateral move.