I remember deciding against Linux Mint awhile back because there was something about upgrades or support that was not as seamless as other distros. It was something like upgrades aren't really supported. Is this true?
Not at all. There's instructions on how to upgrade from 17.1 to 17.2 on the site.
Maybe you are think of the difference between a "rolling" distro, and one that's not?
Yes, maybe. Is there a difference between the Mint model and Ubuntu/Kubuntu/Lubuntu? Does Mint have a long term support release? I remember the LTS appealing to me because I didn't want to upgrade/reinstall all the time.
Mint 17.1 and 17.2 are both LTS releases. LMDE (Linux Mint Debian Edition) is a rolling release.
I think I see my confusion. The wikipedia kind of makes it sound like the 17 version is the first long term support offered or maybe there are just enough other versions that don't have long term support I got the impression they didn't have one. It says the 17.x series is supported until 2019.