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 own a Galaxy S Blaze 4G, first and foremost, I'm sorry. But, you can make it a lot less horrible if you flash CyanogenMod 10. And as of today, that's something you can actually do, and that's kind of exciting.
The CM team has cooked up the first nightly build for the device (see nightly disclaimer above), which will bring you up to full-on Jelly Bean. And if you're coming from Gingerbread, that's like stepping out of a 1990 Ford Fiesta and into a brand-new VW Golf. It's shinier. It's faster. It does more things. Of course, nightlies do have their caveats, so as always - flash with care. Hit up the source link to get your ROM on.