HiDPI support has been garbage for at least 2 years. I'll get scaling and resolutions right for my XPS13 QHD, and then I'll plug in a 1080 monitor and it goes back to looking like crap. The sound goes out unless I cold boot twice. Then I need to use Wine to run Photoshop in a barely legible font size because hidpi scaling won't work. God help you if you want to manually configure your display manager, as you'll end up with an unusable display and hours of SO on your hands.
That's not to mention the ton of visual and "feel" issues behind using even Pantheon/eOS, which feels like a fork of OS 10.5.
I recently built my own hackintosh and am quite happy with it. I do all my work on the Mac with integrated graphics (don't need a GPU, which is great because the Nvidia web drivers are indeed terrible) and switch to Windows for games. Couldn't be more pleased.