Mid set-up, and the desk hadn't been dusted yet all that dust is leftover from my old computer, which I hastily removed before setting this up.
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I'm in the midst of getting programs and files set up, which is taking hours and hours. It may go into days... The screen is wonderful, although I haven't had much chance to try it out yet. I did go for a spin in Lightroom, which I found to work fine there may be a bit of lag in some actions, but I've had it MUCH worse before. Also no problems with Mission Control yet.
To be honest my biggest surprise is the sheer size of the thing! Moving from the 15" Retina MacBook Pro, and being pretty close to the screen, it's taking some getting used to. My sitting position is going to be much healthier with this machine!
I'm also finding I made the right decision with the Magic Trackpad. I actually bought a Magic Mouse for my laptop back when I got it, thinking that I've always despised trackpads and would definitely want a mouse. Well, that turned out to be wrong, because of the multi touch features, and especially the four finger swipe, which is my favourite feature of OS X. The Magic Trackpad is slightly different from a laptop trackpad, but I like it a lot. The size is very nice, and I'm already used to using trackpads for extended periods thanks to my laptop.
All in all this was a great purchase. I hope you all get yours soon!