Hey. Im am writing on an 2713HM right now and i had an 2711 before, so i might can help.
At the time, where i bought this monitors they both had the same price. Now the 2713 is slightly cheaper in my region.
The 2711 is a really solid, high quality monitor! The only reason i returned it was his strong AntiGlare.
But it is very bright has a robust stand and has a wide garmut (if this is intererresting for u).
On the other hand the 2713HM's stand is a bit wobbly, it has always bit of Blacklightbleeding in the lower left corner and i see this diagonal pattern as well. I've found a picture of it. http://i46.tinypic.com/2h6vhjl.jpg
It is best to describe it as a moireeffect or something like that. Its only in the lower half of the screen and has definitly something to do with the AG-coating. If u onces recogniced it u see it all the time, so the 2713 is going back as well!
LCD-conditioning wont work, i tried it!
I'm one step ahead from trying a yamakasi korean screen but there are so much bad reviews ^^
Conclusion: In my opinion 500Euro for that bad AG-coating is to much. If you aint sensitive to such things they are good monitors.Edited by He4DcR4Sh - 1/5/13 at 6:28pm