At first, I thought the pillow looked too thin to be comfortable. I was veryskeptical that it would even be worth the money. The grooves designed inthe pillow are perfect for nasal mask users. I use the Resmed Airsense 11with the Philips Respironics nasal mask. The air isn't getting cinched in thesides of the mask when I lay on my sides which causes the air to blow harderelsewhere. I have good support for my neck and I don't feel like my headgets hot when I sleep. If I feel like I want my head raised I simply put myM*P*llow underneath. This CPAP pillow fits easily into my standard pillowprotectors and pillowcases making it easy to care for. I honestly was goingcrazy with getting acclimated to sleeping with the mask as a new user.I was waking with constant neck pain, headaches, and perpetual mask leaks.I highly recommend this pillow for new and seasoned CPAP users!It’s probably fine and helpful for full face mask with hose coming out of it. I have just a nasal cushion with headset- frame that has hose attached on top of the head with a swivel elbow. The frame air cushion can squish too much sleeping on my side and cause the nasal cushion to leak air so am constantly fiddling with it. This didn’t help that issue, and it felt too hard/firm for me to get used to. It has a nice neck support laying flat, but I also need elevation and was not as comfortable with that elevation.I never could get it to work with my cpap mask and hose. I appreciate the company standing behind their product and offering me a refund. I will try their products again because of the customer service they provided.5 stars for customer service3 stars for the pillow4 stars averageI am no stranger to memory foam. My last two pillows have been a high quality brand for $100+. I literally use them until the foam disintegrates from over a decade of use. This pillow was too firm and too thin for me causing neck/upper back pain and headaches. It should be noted I’m a plus sized gal, so maybe someone with smaller shoulders would be okay with the height, but it felt like there was no give as far as comfort. The pillow itself is a great idea. My mask fit nicely over the cut out and made my mask that much more comfortable to wear. My seal was also improved. So kudos for the design idea. It just didn’t work for me.Update: customer service reached out to me and offered a refund. If they make a thicker softer version, I will buy from this company again.My husband started using a CPAP machine several months ago. He struggled for about a month before there was enough communication (insert eye roll) for me to figure out WHY he was struggling. His mask would leak when he rolled onto his side. Enter the Side Sleeper pillow! This thing is awesome!! He absolutely loves his new pillow! Usually there is an "adjustment" period getting used to a new pillow (maybe that's just us) - but he loved it from the first night. HIGHLY recommended!!So far so good haven't had it long enough for a good assessmentI bought this to lay flatter and for when i am using my Cpap. I wish it had mor neck support so that it also helped aligned the spine better like for Cervical Spine Alignment. It could be great if it did that also.After using it for about a week it is now the only pillow I use. I also like the way the cover can come off and be washable. Couldn't ask for more.I loved mine so much I bought one for my son and he now loves it too.J’ai acheté ce produit pour mon épouse et elle très satisfaite du produit.