I like the HD, though I have one minor beef: The time/date stamp inside my guild board is almost unreadable on my iphone. It is black with a white dropshadow on a brown background. Given that that is the one screen where I really look at game world time, I find it fairly aggravating.
I quite like the HD version but I guess it's just a matter of taste.
I have no more problems with the normal than I do with the HD.
I have had some connection issues between my client and the server recently though. Not sure if it's client side, server side or network related.