hey, I just installed mint onto my old computer (433mhz pentium III, 256 mb ram), and I loved it!
But there were a few things I noticed...
1. It seemed as if it was laggier when xcompmgr was disabled rather than enabled. I'm not quite sure why this is, so I just left it on. (Isn't it supposed to be the other way around?)
2. At first I had trouble mounting my external usb hard drive, but I edited my /etc/PolicyKit/PolicyKit.conf like what was shown in the link
http://bbs.archlinux.org/viewtopic.php? ... 05#p5069053. I couldn't unlock the keyring for "time and date", but it worked after I opened up Authorizations, and in the "Manage System Configuration" section under Implicit authorizations I modified "Console: no" to "Console: admin authentication" and it worked

Overall though, it's wonderful! =D