I have the exact 27" iMac you are looking at, Nick. Its night and day difference and that difference is for the better. There is no loud ass fan on the iMac, you cant hear it run. If you use it right out of the box with the Magic Mouse you only have 1 cord and thats the power cable, everything else is wireless. I opted for a wired keyboard with numeric side keypad and I bought a Focal 2.1 Multimedia Sound System from Apple because I wasnt crazy about the sound coming from the iMac.
I’ve had mine for about a year with no issues, I bought it at the Apple store in the Crossgates Mall. If you get it, you certainly won’t regret it. Like I’ve said previously, you notice the difference in build quality alone. Keyboard is aluminum as well as the iMac shell.