I just was at the Apple store in Palo Alto…yea, pretty nifty with an all-glass-curved roof.
Checked out a 30" 4K display, pretty neat, but didn't put it through it's paces to see all it can do.
Was asking stupid questions repeatedly because I wasn't getting the answers I wanted. Cute girls working there seemed blissfully happy regardless.
Drooled over the 27" iMac…it's pretty damn sweet, wanna get it to update my 24" iMac. BUT…I've found for overall general use, a 23"-24" monitor is really outstanding and flexible. A 27" can blow your socks off and burn your retinas out if you come home late, it's dark and you jump on to check whatever…the 27"-28" I had didn't get used nearly as much as my 24" until it was needed to review plans, see movie/video, major web surfing/shopping/researching/megawindows. Apple also has the 21.5" which is fine as well, but I've been a 23"-24" fan for about 10 years when I had an Apple 23" Cinema Display.