Used the Doublenest for just about a year, and recently stepped up to a Blackbird. There's really no comparing the two, except I think the ENO was a great way to tinker with suspension and learn the proper way to hang without harming my finances. I'll hang on to my Doublenest forever - I take it with me on road trips and love to hang out under the stars in it. The built-in features of the Blackbird really make the ENO seem basic at this point, though, and the ENO bug net is pretty poor-quality. I like the fact that ENO's are sold at REI and therefore get people into hangin'...
I'd rather be in a hammock. - Dolly Parton