I was initially nervous about this purchase (especially since YS seems to have deleted some older reviews for this item that weren't all positive), but my fears were put to rest when it arrived in the mail. What a beautiful cardigan! It should be illegal how much I love the print on this. Absolutely gorgeous. The colors are darker and not quite as vibrant (neon) as they are in the photos, but I feel it actually looks better like this. The khaki color, especially, is a shade darker; the photos make it look like a creamy beige, but it's closer to a wet sand color.
About sizing - I'm usually a US medium, so I was worried the most about buying the small size (since all other sizes were out of stock). It still looks pretty nice! The sleeves ran short (I'm 5'5" 113lbs) so it looks more like a 3/4th sleeve cardigan, but I still adore the style (I can wear my wrist-accessories hassle-free) and the sleeves aren't tight, just a little more fitted. I'm having some trouble wearing long-sleeves under it, though. I'd recommend waiting and getting a bigger size if you're my height as well, since this cardigan is also a bit on the short side (sits about 2 inches above my hips).
(Unless you like your tops to run a bit short, then you're good.)
The only other thing I'd have to say is that the material is pretty nice, but not as comfortable as a soft wool or cotton jacket (and there's two loose strands in the middle of the knit--which is disappointing if it'll make holes with repeated washing--but otherwise a minor defect). Even so, I'm dead set on purchasing another one of these when the larger sizes come back in stock. I love the small too much to exchange it! Hands down one of my best purchases from YesStyle.