Awesome for setting up in bed, I use them for support in that manner. I personally find it uncomfortable to sleep on memory foam at all but I needed a backrest and these are great! 
They feel cooler than any other memory foam I've used, I have sensitive skin and usually feel suffocated by memory foam but the casing and covers on these are wonderful. It's so neat that you can take out some fill if you want less support. Washing the covers was easy with no issues. I always use cold water so idk how they'll do with hot but I'm sure it's fine, they're well made. 
Keep in mind they are very firm & stiff when fully stuffed. 
Very pleased! Thanks!