I have been enjoying the pillow gel and it keeps my head nice and cool. The bottom pad absorbs heat for a while and then gets too warm and I have to move to a different spot. It could be a bit bigger to accommodate all of my moving around to stay cool. Not as good as Outlast.
The price was higher than I would have liked but it actually keeps the bed cool. The pillow pads move around a bit but are also reasonably cool. I thought they might be warmer under the head but I was wrong and they were actually reasonably cool. I would buy more if needed.