Is there a big difference between Ubuntu with GNOME Shell and Ubuntu GNOME Remix?

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http://askubuntu.com – I want to try Ubuntu (tried different distro's many times before), but none were really to my liking. I always seem to be drawn to Ubuntu, thanks to the PPA's and software. What I don't like is Unity, particularly the Dash. That's why I want to use GNOME Shell, I like it. I know you can install GNOME Shell in Software Center, and uninstall Unity, but won't there be tons of Unity's configuration files left? And would upgrading from 12.10 to 13.04 still work? I know there's GNOME Remix available, but is there any advantage over the standard Ubuntu with the Shell installed? (HowTos)