These are just Romanian AKs, CAI does nothing but install a US made pistol grip, US made fire control group (hammer, trigger, disconnector), and a US made gas piston, and in the case of the WASRs they mill the mag well out to accept standard mags..
Probably what you were looking at were WASRs as I believe the SARs are long gone. The WASRs lack mag dimples in the side of the receiver above the mag opening, but it's merely cosmetic. As stated they can be had in low-cap only models, but most have been milled to accept standard mags. They are Euro-spec AKMs basically and will accept all standard parts.
The Fire Control Group that Century uses isn't the best, but functions just fine. They often suffer from "trigger slap" (where the trigger seems to bite back at your finger as you're shooting), which you can fix with a little attention to the rear of the disconnector with a file/dremel or you can swap in any number of other US made FCGs... I polished mine up a bit and am fairly happy with it.
Every once and awhile someone will complain that the magwell on the WASRs seems a little tight, usually with drums. You can also clean that right up if get unlucky.
It has nothing to do with being CAI or not but what I would concentrate on is getting one that has a nice non-canted front sight base and gastube. Alot of AKs (not just Romanian) suffer from the front sight being installed canted to the side just a bit on the barrel, which results in you having to move the front sight post itself to one side or of the other to get it zeroed, that bothers some people...
I have a SAR1 still and had a SAR2 (5.45x39 version) and I really like them. If you're not expecting a rifle with a really nice fit and finish (it is an AK afterall) they are great for cheap IMO. They're also fun to tinker with. I never had a jam or malfunction of any kind in either of mine, combined total of around 4000 rnds through them...
If you're interested at all I'd get one. I don't care for the funky handguard you're more less stuck with if you get a Saiga, and they seem to have dried up somewhat anyway.
For all the info on Romanian AKs visit here:
http://www.gunsnet.net/Linx310/