I have an ENO double, as well as a Snugpack Jungle Hammock (bugscreen built in). By the time you add insulation underneath you, there really is not much, if any weight savings. That said, it is substantially more comfortable, and I personally get much better sleep.
This weekend I spent in the mountains of central Idaho, and took my 1 man tent along. I was regretting it in about the first 5 minutes of trying to sleep. My ground pad was just not cutting it like a hammock, comfort wise.
