Green Ganesha said:
More comfortable, in fact, than many of the cheap hotel beds I've endured.
LOL! We've move than a few times pulled the mattress out of the WilderNest into a hotel room or into someone's house (my parent's have this hide-a-bed/torture device for example) to sleep on.
We have a pretty good mattress in the 'Nest. I ended up using a 2635 closed cell urethane foam. The measure 2635 means it has a density of 2.6 lbs/cu-ft and has an ILD of 35 lbs. Our mattress weighs about 20 lbs and I at 175 lbs sink maybe 20% of the way into it. There are foam places around (I got ours up in Boulder, CO, at a place called The Foam Source) and they can fix you up with just about anything you'd need. The key to finding a good mattress is knowing the ILD, which is indention load deflection. This is the measure of how much foam compresses under a weight. Ours is 35 lbs, which means a 50 sq-inch (generally round) indentor took 35 pounds to compress the foam 25%. An ILD of 35 would put this as a medium-firm mattress. I think ours is every bit (or more) comfortable as our home bed. A very firm mattress would be about an ILD of 50 and very soft mattress would be about an ILD of 20. Most average people find a comfortable mattress in the 25 to 45 range, but it does depend on the thickness of the foam.
I don't think it's odd at all that you don't find your stock mattress uncomfortable. It's probably a perfectly fine mattress, but it's just either too soft or firm for you personally. You wouldn't expect one size shoe to fit everyone, so not everyone will be happy with the same firmness mattress, either. Find a foam store locally, it's worth the time.