So I've been using my DownHammock for a while now, and I've found a weakness that I should have predicted but never thought about it.
As I've used it over time, the hammock body's material stretches. But the shell doesn't stretch...so the loft right under my butt is getting thinner. It's still plenty warm for most temps, but I can definitely tell a difference from when it was new.
But seriously, this is so easy to make that sewing a new version every year wouldn't bother me. That'll give me an excuse to tinker with the design, too!