This mattress pad is exactly what we needed. Only had it for a week but we haven't had any problems with it moving around. The sides are very deep and fits our pillow top perfectly. It seems very sturdy and I'm sure it will last a long time.  

P.S. - Mattress pads are to protect your mattress not to make a 2x4 feel like a cloud. If you want added comfort you need a matress topper.