I've been away from Mac Desktops for years, but bought a refurbished iMac 2017 i7, 16GB RAM, 1TB SSD, Radeon 580 two weeks ago and am totally floored.
My last desktop Mac was a Core2 Duo (I think it was the first aluminum body Mac that came out) and while the iMac looks similar there's no comparison. The screen is gorgeous. I've got it next to a relatively decent 4k Asus and the iMac puts it to shame. I'm not a fan of the little wireless keyboard or the Magic Mouse 2. The mouse seems ever so slightly laggy. I have a Magic Trackpad 2 scheduled for delivery today and am hoping that it is a better experience. The little wireless keyboard just doesn't fit my hands well. There's something "off" about the right side of it. Currently, I'm using the old wired keyboard from my iMac Core2 Duo. I was going to order an Apple wireless with the keypad, but after seeing all the complaints about it bending and seeing that it is backordered by a month, I think I might wait and see... though I'm eyeing a Matias backlight keyboard.
I've seen a lot of complaints about fan noise, etc., but other than the fan kicking on after about an hour of gaming in Windows 10 (Bootcamp) I haven't heard any other noise from the machine. I was playing Stellaris, so it probably wasn't too taxing on the machine. Other than Bootcamp for GIS software and the occasional game, on the Mac side I've used mostly Adobe Creative Cloud, Safari, and Office/iWorks without any trouble. One thing that surprised me was setting up my three printers. Two are large format professional grade printers and one is a consumer printer. On Windows I was always having some weird issue with them and it was always a pain to get them setup correctly after installing Windows, but getting them all setup on my iMac was surprisingly easy. I had mentally prepared myself for a day of frustration and that didn't happen. Installed Epson drivers for the two big printers, added them, and they worked without a hitch.
TLDR: New iMac awesome!
My last desktop Mac was a Core2 Duo (I think it was the first aluminum body Mac that came out) and while the iMac looks similar there's no comparison. The screen is gorgeous. I've got it next to a relatively decent 4k Asus and the iMac puts it to shame. I'm not a fan of the little wireless keyboard or the Magic Mouse 2. The mouse seems ever so slightly laggy. I have a Magic Trackpad 2 scheduled for delivery today and am hoping that it is a better experience. The little wireless keyboard just doesn't fit my hands well. There's something "off" about the right side of it. Currently, I'm using the old wired keyboard from my iMac Core2 Duo. I was going to order an Apple wireless with the keypad, but after seeing all the complaints about it bending and seeing that it is backordered by a month, I think I might wait and see... though I'm eyeing a Matias backlight keyboard.
I've seen a lot of complaints about fan noise, etc., but other than the fan kicking on after about an hour of gaming in Windows 10 (Bootcamp) I haven't heard any other noise from the machine. I was playing Stellaris, so it probably wasn't too taxing on the machine. Other than Bootcamp for GIS software and the occasional game, on the Mac side I've used mostly Adobe Creative Cloud, Safari, and Office/iWorks without any trouble. One thing that surprised me was setting up my three printers. Two are large format professional grade printers and one is a consumer printer. On Windows I was always having some weird issue with them and it was always a pain to get them setup correctly after installing Windows, but getting them all setup on my iMac was surprisingly easy. I had mentally prepared myself for a day of frustration and that didn't happen. Installed Epson drivers for the two big printers, added them, and they worked without a hitch.
TLDR: New iMac awesome!