My mom has the petite core and loves it! I was crying to her over the phone on day 3 of yet another migraine... And she, also a long time migraine sufferer, said after her chiropractor gave her the petite core pillow, her migraines became very few and less often. I went with the gentle, mid core. I'm a short stack at 5 feet tall with a very short neck, so perhaps I should have gone with the petite core as well- I was just not thrilled with the firm option as I tend to like pillows fluffy and squeezy. I spent three nights sleeping on the mid core, attempting to adjust to it, and every night I woke up in the middle of the night with knots in my neck which is usually the beginning of a migraine for me. I was so sad this pillow did not work for me... But my mom loves her petite core. I'll be gifting this pillow to my mom as well.