I bought the groove pillow in early May. I had been having neck pain for quite a while upon waking. After trying several different pillows (soft/firm/low/high) I was sceptical about the groove pillow but I was getting desperate for a pain free nights sleep. The groove pillow arrived and I must admit I didn’t see much of a difference in my neck pain. I am a side sleeper and I struggled to get comfortable while using it. However, I persevered with it and now several weeks later I no longer wake up in the night or morning with any neck pain , discomfort or headaches. I cannot recommend this pillow enough it certainly worked for me.