I've recently switched back as well and I find that it's back to a much better experience. Firefox was horrible for a while, but I think the team have been doing an excellent job of optimising it.
My only annoyance is the development tools - Chrome still whips FF here - and they are still no where as good as Firebug, which continues to be the most required extension - but I believe work is being done there too.
Chrome Dev Tools were what ultimately lured me over to Chrome full time. The Sync tool is pretty good too. I don't really get these memory issues everyone talks about. Maybe it's because I'm not on OSX but on Linux and Windows I regularly have 20+ tabs open for weeks and have no issues... even if I'm playing video games that take up 60% of my memory when Chrome was taking up 50% as it was it seems to play nice.
My only annoyance is the development tools - Chrome still whips FF here - and they are still no where as good as Firebug, which continues to be the most required extension - but I believe work is being done there too.