Seteen implies a tight weave and soft cotton. The quality in this set is reflected in the cost -bargain grade. The fitted sheet has many visible weaving stripe inconsistencies which will reduce life of the sheet and compared to other Sateen sheet sets.
These sheets will probably pill and are slightly scratchy. Because it is only for a guest bed, I will offer the older better sateen sheets to my daughter when she moves out on her own.
I would compare these sheets to a good 200 thread count sheet set, not the 400 count as advertised.