I bought a 27'' iMac with the following specs: i7 4.0 512 SSD 395X 32Gb I'm a designer / creative coder (front-end stuff, webgl, etc) who has been using Windows for the past 15 years or so. I have an iPhone and a Macbook air and as it was time to update my desktop computer i ended up buying an iMac that i received some days ago. - The screen: very nice. Colors and resolution are very good, but honestly if you are used to quality 4k displays you get pretty much the same experience with them as the retina iMac. I also checked (thanks to this forums) if it had backlight bleed and yes it did. It wasn't noticeable until I upped the brightness to 100% and placed a black image on the screen. It was very minor I would say and nothing that made me think about asking for a replacement. - The noise: it is very very silent. I was kinda worried reading this forums that the fan would annoy me but honestly I couldn't hear it while sitting in front of it. I had to lean the iMac back and place my ear on the exhaust to be able to hear the air coming out. It was a very faint and pleasant noise. As soon as I placed it back to normal position could no longer hear it. - The mouse: OSX gestures integrated on the mouse are nice but my hand didn't like it after some hours of usage. It was also less precise in Photoshop and text editors than some other quality mice I have (I use zowie gaming mice even though I don't play games because they are ergonomic and precise). - The graphic performance: this was a deal breaker for me. As I said I don't play games but I consider myself very demanding in terms of graphic performance on websites as it is my job. I honestly think that the 5k display is too much for the laptop gpu the retina iMac has. I tested several "gpu demanding websites" (they are websites, nothing close to heavy 3D applications or games) with webgl experiments, rescaled images, scroll effects, etc, running in all major browsers on my old windows machine (gt 670 gpu), the 2013 macbook air and the new 2015 retina iMac. They were all pretty smooth on all devices except on the iMac, where some animations were noticeably choppy or jumpy. I though I was being paranoid so asked my girlfriend and she came to the same conclusion. I'm very disappointed, even a macbook air with its tiny screen and modest gpu handled everything better on all browsers. Hell even scrolling this forums was smoother on the two other devices. I'm going to return the iMac and buy a PC with pretty much the same specs but a geforce GTX 980 on it. I prefer OSX than Windows but they are just tools with options, what matters is what you can create with them.