I bought a GhostPillow for my father-in-law (a side sleeper). He likes it so much I bought 3 more as Christmas gifts, and one for myself. It's thickness is greater than my previous pillow (I'm a stomach/side sleeper). But now that I've slept on it for 4 weeks, I love it! The off-gassing lasts about 4 days, so I removed pillows from packaging before wrapping.
I really like this pillow. It's cool to the touch and I don't wake up with neck troubles anymore. I feel like I get a better night's sleep because I'm not tossing and turning, keeping my wife awake. I highly recommend for hot sleepers or side sleepers. 5/5 stars.