I am very pleased with this mattress pad.  First of all, it comes with very deep pockets. I have a 14 " in mattress and there is plenty of room and the stretch is not tight, there is plenty to tuck under.  I tested the waterproofing because I had never had this silky kind of material for a waterproofed bed pad. Works well.    Also I beieve the silkiness of the material will better prevent bunching of the pad.  Wish the surface pad was a little bigger, it just makes or is slightly short if the edge of the bed.

Pros: Great for deep mattresses, good waterproofing
Cons: Just makes the edge or just a tad short of the bed edge on my new queen hybrid mattress