I posted the wrong amazon link, http://www.ebay.com/...r-/140934439651 , if you look at the sellers feedback they are shipping 5+ of these screens everyday with no problems.
There a reports of the casing not being the highest quality but that's about it.
I don't know where you are getting they are class B or C panels? Care to share your source? Apparently they are A- panels (stated here: http://forums.whirlp...archive/2023067)
You can pay $30-40 more for a 0 dead pixel guarantee model. I cant remember how many counts as zero but I believe it is under 20 pixels. Not that you can really spot a dead pixel on such a high PPI monitor without green screening.
If you go with green sum as the seller in the link in this post then you know they will replace it or refund you if it is faulty. So the only downside would be having to ship it back to Korea. Well worth the risk IMO.
i just assumed that because that tends to be the case with the cheap korean brands, A- is not bad. you definitely can notice a dead pixel on these displays though depending on where it is.