Any gun manufacturer can have issues. Though these 2008's are better built when compared to other/most Century products (probably mainly because they're outsourced and not built by Century). I don't know if it's simply because places like AIM have sold a lot of them the last 5-6 months. But problems have indeed popped up. It's up to you whether you want to buy one or not.
The most common issue you MAY run into is the "gremlin".
http://www.ar15.com/forums/t_4_99/145592_Tabbed_bolt_carriers_and_the_vz58_gremlin.html
The issue may show up right away or may show up later down the road. 50, 100, 300, 500+ rounds later. Or it may not show up at all. It can be prevented though. But since Century can't legally do the work beforehand (CSA/Czechpoint owns the patent). You'll have to do it on your own or farm it out.
Problems or possible problems. Take them for what they are. Is it a bad product or simply showing up because of the number of guns sold? I don't know. But if you do get one. I'd spend the time and/or extra coin and tab the carrier. I have a couple CSA vz. 58s and love 'em. But if I had an extra $400 and wanted another 58 type rifle. I'd buy one. To me though it simply boils down the this. Any gun company/manufacturer can have issues. But if I buy a CSA, CZ, Beretta, Mossberg, Colt, FNH, H&K, Ruger, etc firearm, I'd be surprised if I had any real issue, but they can happen. But if I buy a gun made by Century (including the 2008 (though it is farmed out), Taurus, Chiappa, Diamondback, I.O. Inc, Kel Tec, Phoenix Arms, etc, I'd be less surprised if I had an issue. Though these companies make many good guns as well. Just could be more likely to run into an issue.
http://www.ar15.com/forums/t_4_99/154272_Finally_shot_my_VZ_and_found_a_new_problem.html
http://www.ar15.com/forums/t_4_99/154724_Bent__beat_gas_rod_s_.html
http://www.czfirearms.us/index.php?topic=61378.0
http://www.czfirearms.us/index.php?topic=62126.0
http://www.czfirearms.us/index.php?topic=62074.0
http://www.czfirearms.us/index.php?topic=63397.0
http://www.czfirearms.us/index.php?topic=63717.0
http://www.czfirearms.us/index.php?topic=63922.0
http://www.czfirearms.us/index.php?topic=63999.0
http://www.czfirearms.us/index.php?topic=64092.0
http://www.czfirearms.us/index.php?topic=64092.0
http://www.czfirearms.us/index.php?topic=63965.0
Some of these I'm sure are gremlin issues. And some may even be ammo/user error. Just providing some reading for you to peruse. I'm think they're a good buy at $500 from places at AIM. They were an excellent buy when the sold for around $400 earlier this year. Just like any gun. I'd look it over before you have it transferred. And I''d get the carrier tabbed and clean it up and shoot her.