I liked the 900s - a lot - so much that I still think about it and sometimes regret having returned it. But now I've spoiled the review.
There is again so much I liked, namely, the fact that 12 inches is the perfect size for an ultra portable laptop, especially the ultra-slim, featherweight chassis of the 900s. I had an 11-incher for a while that I loved - but as a tablet, not a laptop (even though it actually was a laptop). And the 13-inch laptop I did end up with (Samsung Notebook 9 spin) is not much bigger, but does not satisfy my need for total sleekness like the Lenovo. The Yoga 900s is just so thin, so lightweight, and just large enough to be a) considered a real laptop and b) house a screen large enough to be completely productive or fully entertaining as needed. The screen has not only good viewing area, but a realistic and natural color gamut (the Samsung's is a little too vivid, though maybe a little more exciting and pleasing). And the battery was incredible - so good I realized other machines have given me a dead battery anxiety I would now have to cure (and which the Samsung has now rebirthed because of its terrible life). I had the champagne variant, which I was worried about since I ordered online without actually seeing the exact color or texture. However, it was muted and classy enough to be enjoyed and displayed to the world, while having just enough panache and intrigue to be a little more interesting for those who want to show some personality. (I speak as a hetero male who would have ordered the vivid orange from the full-size 900 if they had offered it on the S.) I really can't emphasize enough how successfully Lenovo nailed the champagne color - just perfect. Finally, again related to the color, the champagne keys matched the outer shell perfectly, and did not show grease or dirt at all (grease transfers from my fingers to the Samsung keyboard and touchpad in the worst, shiniest way).
I had just a few reservations which, given the high price of the 900s, I decided not to accept. Peripheral connectivity - I really wanted to get into the USB-C generation (if not Thunderbolt II), but I needed at least one more USB port that was not already being used for power and either a full or micro-SD slot. They keyboard was comfortable to use - it's soft resistance making up for the shallow key travel - but the Ctrl button for the right pinky was excruciating to reach - I felt my pinky cramp up every time I typed so much as a brief email. Finally, and this is a Lenovo thing, not being able to give the mouse touchpad a two-finger touch to perform a right-click. Actually having to click the pad as a mechanical button (with two fingers) was fine for most uses, but many times I need to maintain absolute mouse silence or plain just WANT to do the silent/quick two-finger touch WITHOUT pushing the entire pad. By now I have revealed that I am OCD, I fully admit it. But pretty much every laptop from every other major manufacturer will let you execute a right-click either way; I'm not sure why Lenovo doesn't follow suit. I would also complain, if I hadn't ended up in the exact same situation (actually, the way Samsung does shortcut keys, especially the Fn functions, is even worse than Lenovo!), about the lack of media keys. Play/pause is a critical key for any consumer device, and even enterprise machines have them, if not also the track forward and track backward. Why not Lenovo (or Samsung)? Finally, I found the m7 chip to lag a little and stutter on simple things like scrolling webpages - however, I never had that problem on my 11-incher with m5 chip, so in fact I don't think it was the hardware and believe that some firmware or driver updates would have resolved that soon enough, so I am going to keep this particular complaint in my back pocket.
If any single one of these reservations had not been, I would absolutely have kept the 900s, especially in champagne, and been happier with that machine than the one I did keep. But it's expensive, and I needed it to have just one fewer flaw for my hard-earned money.
If you or your friend decides my above reservations are livable (or your pinky does not cramp trying to hit the right-hand Ctrl), and you think you want to spend so much on such an incredibly attractive and sophisticated little machine, then do it - I will not only be happy for you, I will actually be envious of your gorgeous, modern device.