I slept in a friend's singlenest this weekend and was blown away. I'd never tried one before and had this elitist notion that HAABs were entry level or obsolete, or something like that. It turned out to be the best night I've ever had in a hammock, and I've had many great nights above ground. The parachute nylon feels awesome and I was actually most comfortable laying inline, rather than diagonally. I think it just fits me perfectly. I didn't get any hot spots on my heels or sore backbending knees, and I was able to pull a summer weight SB over it tube style (a la Jeff's site). That's a pretty rocking summer setup with some kind of bugnet head bivy. I don't really need any advice, I just have to gush!
I'll say I love this style of hammock, but I wouldn't say I love HAABs, because I think when I get one of my own, the hook and the bag will come off pretty quickly.