It is really fast. This is important because I like to run a lot of bloatware, concurrently. More speed is goodness. It means I can keep more balls in the air.

It's more beautiful. The screen is brighter, clearer, just qualitatively superior to the previous iMac.

They keep moving parts that shouldn't move.

They keep changing the plugs in the back. So old devices stop working because there's no more Firewire on the thing, for example.

The keyboard has the Control key in a different place. This meant that for the first few days I can't type quickly, everything has to slow. down. so. I. can. be. sure. my. fingers. are properly. positioned. over. the. right. keys. Try typing with a period after every word and you'll get a good idea what the re-learning experience is like. And what will it be like when I go back to the MacBook Air, which I still use when traveling? I'll let you know.

A few pieces of software I depend on required upgrades to run on the new OS. One of them wasn't free, VMWare, which charged $45 for the upgrade. Not sure if I get any features I need for this, but it does work on the new OS.

They fucking changed the way fucking scrollbars work. That would be a glitch. But the travesty is that there are things you can't do on the new scrollbars that you can do on the old ones.

I am a serious professional computer user. This would be like Fender moving around the frets on a Telecaster. Or the knob that adjusts the pitch of one of the strings. Maybe I can adjust by composing my song in a different key, but tell me, what the fuck were you thinking when you did this, Apple??

I'll forget eventually what bullshit this was. That's why I have to write this review now, to vent the sputum they added to what otherwise would have been a mostly-lovely experience, for which, btw, I paid $2500.