It's ridiculous. 3200 x 1800 resolution on a 13-inch display. That's better than the Macbook retina. Everything is fantastically sharp and clear, even down to the tiniest text. My biggest fear had been that apps like Quickbooks, Outlook and Excel etc wouldn't scale properly, but as it happens they all look fantastic and work fine. There are one or two scaling problems (the calendar pickers in Quickbooks are all bunched up and tiny, but I can still use them) but overall it's just a fantastic laptop experience. You wouldn't think that this would be doable on such a small screen, but I have Quickbooks and Outlook open side by side and I have no trouble working in each. I'm finding that tiny text is no problem with such a small dot pitch, just like my iPhone (in fact better). I have no eye strain, whereas I'd get a headache trying to read things that small on my regular monitors.
Not everything scales correctly though - Adobe stuff like Photoshop and Illustrator for example. The icons and text are so teeny tiny as to make them unusable (according to what I've read from users). Adobe are blaming Microsoft for problems with their scaling API's, although given that some of their apps (like Lightroom) scale without problems, I'm not sure how long they can blame someone else. People have posted workarounds but for now I'm just happy with what I've been doing on my laptop so far. Browsing is great, although Firefox scales much better than Chrome.
The worst thing about all this is when I look up to my regular giant monitors after a good session on the laptop. I've spoiled my eyes. It's like going back in time, everything looks so pixelated. I would love a full size QHD+ monitor, although the cost is just too prohibitive at the moment. This has made me think about how utterly great Sonar would look on this kind of resolution if it was fully scalable. I'm not sure how it would scale given their use of bitmaps in the UI, and I wonder if Cakewalk will eventually transition to a vector based UI in the future (apparently FL Studio is already on this).