I have neck issues (herniated disc), so I first tried the Purple Harmony pillow. That pillow did not work for me, so I was able to donate it to a shelter and get a refund. I was bummed, though. Then, this TwinCloud pillow came out and I thought I'd give it a try. Very happy that I did! I haven't had an issue with it going flat - I fluff it every now and then, usually use the firm side, but love the option to use the soft side if need be. I haven't used it as an unzipped large pillow because it doesn't have enough support that way, but it's so nice that I can choose firm or soft depending on how my neck is feeling. Very cool pillow and concept! It's been over 6 months now that I've been using it.