It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.
If you're looking for a way to freshen up your Optimus 2X (read: make it not suck), the team over at CyanogenMod may have something of interest for you. CM10 (Android 4.1) nightlies have officially landed for the 2X (this ROM is not compatible with the T-Mobile G2X), and you can get the first build right here.
Developer Ricardo Cerqueira promises that even though this is an early build, due to LG's above-average support of the device in terms of providing source code and other resources, that it should be "daily driver" ready.
There are some caveats, though. First, you cannot be running a leaked build of Ice Cream Sandwich, because the bootloader is incompatible with the ROM. That means you'll need to do a rollback to Gingerbread or Froyo first. Second, if you are running an old CM7 build, CM10 should be flashable as an upgrade, but there aren't promises on that being a bug-free experience. You're much better off backing up your apps using Titanium Backup and simply starting fresh.
Anyway, hit up the source link to grab the latest nightly now.