There's a lot to like. Things I like which I'll get use of are the 2 Thunderbolts ports and the USB 3 ports, and the Macs speed for crunching numbers. The display is really great! And at 27" I like the 16:9 ratio a lot more than I thought I would have. At that size 16:9 is easily a better aspect ratio.
What I don't like.
1. This is important: the speakers are noticeably worse than my 'OVER 5 YEAR OLD' iMac. That old iMac is a 24" top end aluminium iMac with the black plastic back. It's not subjective, or different, but worse. Positively worse. Because of the thin edge the sound sounds as if it's being funnelled down through the iMac. No, the new iMac is not broken. I hate the way I have to qualify complaints on this site, because some people here are strangely defensive of Apple. I'm actually surprised how bad the speakers are. And no, I won't add on a speaker set. I buy the iMac because I like all-in-ones.
2. Even with the fusion drive, waking from sleep is abysmally slow. Sometimes it's more than 15 seconds before I can move the mouse. This is something I'm sure can be tweaked with a firmware update, but the degree to which it can be tweaked is anyone's guess. My 5.5 year old iMac with an SSD woke from sleep in about 3 seconds, or 5X faster. I was under the impression that the OS would be stored on the Fusion Drive's SSD subset, but the system seems to need to wait for the spinning drive to spin up before it will even give me control of the computer. Even launching Safari seems to consistently wait for the spinning drive. It's abysmal. €2,000 and nearly 6 years later and my computer is much slower at this stuff. Yes, it's not an SSD drive, but I didn't expect this slowness. Safari should be, and probably is, running from the SSD, I use it everyday.
Two of these things are well below Apple quality IMO. Well below. I've already complained to Apple about the audio quality.
I will keep the iMac, I will use the iMac, and I like the iMac, but I don't LOVE the iMac like I thought I would and I really wanted to. Connecting with Screens now takes ages, before it was an order of magnitude faster. In the words of LOLCAT, I'm disappoint :-(
Edited by Ireland - 2/21/13 at 11:34am