Have been sleeping on mine for several days now and they're easily, the most comfortable sheets I've ever owned. They stay very cool during the night and are super sleek. They're not so slick that you slide around on them but yet they have a silky feel to them from the Sateen finish. And the fitted sheet is huge. It fits over my king, with a thick, down mattress topper and I still have to tuck a lot of it in.
Highly recommend these and I'll likely buy another set just so I can rotate them out. They're softer than the majority of 600+TC sheets that are just Egyptian cotton.