Started off great, but over time has caused us back pain.
We purchased the sleeping duck about 2 years ago. It started off pretty good, we found it quite comfy and nice to sleep in. However, over the past few months, my partner and I (both stomach sleepers) have experienced waking up with increasing levels of back pain first thing in the morning. After about 10 minutes and some stretching, the pain is gone. After paying $1500 for the mattress, we would have hoped to get more than 2 years use before having shop around for a new mattress. Left a little disappointed, given the reviews.