According to all the promotional blurb the chillow sounds like the perfect answer to the age old problem of keeping your pillow cool, the trouble is it only works for a short amount of time.
Like others I have suffered from having to repeatedly turn over my warm pillow in bed until I finally fell asleep, and even if it meant spending £25 to have a nice cool pillow it would have been money well spent. And for the first 15 minutes the chillow does everything it promises, the trouble is after 15 minutes the chillow soon takes on your body temperature and rapidly turns from a cool soothing pillow into a warm sweaty sticky plastic sheet which is far more uncomfortable than a warm pillow would ever be. On two occasions I have even woken up in the middle of the night boiling hot and with a splitting headache as I have overheated while asleep on the chillow.
For short term use on sprains, headaches, hot flushes, back pain, etc... the chillow probably works quite well, but for using a method to keep your head cool while sleeping it is a complete and utter waste of money.
Taking into account that all the chillow is actually made of is a 10mm thick plastic pillow filled with a sheet of foam to which you add 3.3 pints of water, I decided to make my own.
I bought a rubberised inflatable camping pillow from an online camping retailer for £2.99 (the old style square type, red on one side blue on the other), a small funnel for 99p. Filled the pillow with water using the small funnel, and now I have a water filled pillow that stays cool for about 8 hours, from the moment my head hits the pillow to the time I wake up. I have never slept better in all my life and my 'homemade chillow' only cost me £3.98!