Go buy these sheets now! A friend recommended them to me when I was considering getting satin sheets. His reasons to get sateen over satin are exactly why I will keep different sets around. Sateen is still extremely soft and smooth over the skin but not sticky like satin. In the hot summer months they flow perfectly over the skin with out catching to anything and keeping that just warm enough with out too much coldness going through. In the winter months they can still keep you a bit warm but depending on your weather flannel would be better.
Washing the sheets are easy. Delicate and tumble dry low. If they are taken out of the dryer right away and either folded away or put on the bed, they will not wrinkle. Even if you forget about it and they do wrinkle which they do wrinkle easily; however, they unwrinkle themselves nicely. No iron needed!
The only thing I do not like is how fast the fitted sheet wore through and ended up with a big tear in it from the fibers falling apart. After two years is when it fell apart. I now use it for pieces around the house. Still, I have two more sets and plan on buying more in the queen size when getting a new bed.