I have read the reviews before buying this one, and I knew not to expect too much from it. I've got the size M for a steal - $14.69.
My first impressions after unpacking it:
+ not too big, not too small. I think Medium size is perfect for backpacking (size to comfort ratio)
- but still pretty big when rolled down / compressed
- the fill felt weird to touch through the cover, at first. It's filled with foam chunks, so it feels a bit slushy, for the lack of better word. Reminded me of cheap old polyester pillows where the fill is spread unevenly and you can feel chunks of it stuck together on one side but it's empty on the other.
+ after a bit of fluffing it up and evening up the fill, it got slightly better. It still feels weird now, but it's actually way more comfortable than I'd expected. I can definitely say it's more comfortable than any inflatable pillows I've had.
+ cover material looks very durable for a pillow, no complaints there
+ it has a cinch with a loop, so easy to clip onto something
+ when rolled up (without extra compression solution) it fits into side pockets of all of my backpacks. I realise it's not very practical but thought it might be useful to someone.
- at the same time it's almost the size of a 2-person tent when packed. You decide if you want a pillow that takes up that much space in your pack ;)
I'm struggling with neck pain so I am very picky when it comes to pillows and comfortable night sleep, but I have faith in this one.
Overall I think it's worth the money I paid, and I want to give this product a fuller, proper review once I've had a chance to test it in the field. I'm going to have to fly a lot in the next few months, then going on a 10-day car camping trip in May and a 12 day Tour du Mont Blanc trek, and I'm bringing it everywhere with him, hoping to get decent level of comfort in the camper, tents and mountain hut beds.
Will update this in a few months :)