Although I would say that my quality of sleep has vastly improved since getting my Ghost Bed and Ghost Pillow, the pillow is definitely the lesser contributor. Put simply, it's too tall. No matter which position I'm in, I find it very difficult to get comfortable. To back this up, I just received a pillow as a Kickstarter reward from a competing mattress company, and it's been nothing short of amazing. I'll keep my Ghost Pillows around for guests, but don't plan on using them in the future.
I've been using the pillow for about a month now. I received the pillows before the bed I ordered. Using the pillows on my old mattress that was too firm, it made it feel like a new mattress. I slept very well! I've been using pillows with new mattress from this company and my husband does stay cooler. Good support for back or side sleeping (not so much for stomach sleeping). The first month, 1 pillow alone is enough. After a month, stacking 2 pillows works better for me. This may depend on how flat or elevated you prefer to be . Overall, good neck support.