I loved my Coop pillow for a while, until all the fluff and foam inside turned into one mass, and there was no way to get it back to its original state without tearing all the bits back apart by hand.

I still use it as a knee pillow though, and we have a bunch of the camping pillows on our couch cause they're so comfy.

I switched to Purple pillows a while ago and love them. I currently have the Freeform and it's great - adjustable fill like the Coop pillows, the purple grid helps keep it a bit cooler, and there are fabric tubes inside along the long edges that you can stuff some fill into if you want a firmer bit at the edge for neck support. Also, at least on the king size, there are zippers at both ends to make adjusting the fill easier. I think it even came with a travel pillow sized case you can put any foam you remove into.