I'm on Fedora, too, actually. Switched when Ubuntu first went to Unity (I don't know if it changed, but Unity was hugely hostile to dual monitors, making it pretty much a non-starter for me).

The ASM issue was something I ran into right after upgrading to Verne, so if you're on Verne, too, then it's definitely something to watch out for. Other than that, the repos have a ton of extensions (I just did "yum install gnome-shell-extensions*" to get them all, since their names are stupid long), and you can turn them on and off with Gnome Tweak Tool, making it super-easy. :)