I switched over to Mint 7 last night, if that gives you an idea of my skill level here
Of a few minor problems I'm having, one is that the buttons belonging to each open window no longer appear on the taskbar. I can still flip between windows via alt-tab, but if something gets minimized, that's the only way to find it at the moment. On a fresh install, the buttons were visible, but after a reboot, they weren't.
I'm dual-booting Vista Home Premium and Mint 7 on a Asus G50v laptop. (which was a %@*&ing NIGHTMARE to shoe-horn in, lemme tell ya)
The only things I've done so far to the OS are to apply fixes to wireless and sound, which are specific to this laptop. (added a intel 5000 and edit alsa-base.conf for a headphone out fix) I don't THINK that's anything that would muck up X (I'm winging it here) I've also ran an update through mintinstall. I've added no extra packages as of yet.
Thanks in advance for the help. Let me know if any additional info/screenshots are necessary.