I searched a really long time for a full-sized futon mattress before I found this one and am so pleased with the quality of this product. We needed a futon mattress that would be used primarily as a bed for my boys, so it needed to be comfortable. Both my husband and I sleep on occasion on this mattress and can attest it is firm and comfortable; nor do we wake up sore in the morning.
There is a chemical smell when it is first unwrapped and it does linger for a few weeks before it completely disappears. I didn’t find it intolerable, just noticeable. I found putting a fitted sheet on it though masked the smell and it does go away entirely probably in about a month’s time. 
I bought from Wayfair bc they offered best price I could find. 
I highly recommend and would buy again.