I have tried a lot of pillows in my lifetime, and I can honestly say, that I have not been happy with any of them for more than a month or so.
I am a side sleeper and I like a well supported pillow that is not overly hard. I liked a microbead (can't remember the brand name) pillow that I bought, but after a month or so, the beads started to shrink/flatten, and then the case became too soft, because it was not full anymore. It was also kind of noisy, even when new. I also have a memory foam pillow (again, can't remember the brand name) that has pretty decent support after about 30 minutes of use, but it starts off too hard and then softens up through the night. The biggest issue with this pillow, is that it sleeps extremely hot. I have tried several down pillows, and even if I get them in extra firm, my head sinks straight to the mattress and the pillow poofs up surrounding my head.
Can someone please recommend a good quality pillow with firm support but not as hard as a rock?