My last trip I bought an ENO on a whim at Piragis (or was it Canadian waters?) right before setting out. It turned out great, but now everyone is wanting to hammock. I remember having a bit of a hard time finding a good spot for one hammock last time.
The bunk works well if you have kids. My sister liked this a lot when I went with her (I'm twenty years older for the curious). I put her up there before bed. I could just reach up to touch her back if she was afraid at night, and let's face it, I had to get up when she wanted to go to the latrine anyway, so it wasn't a big labor to hop out, get her down and go with her. Plus I wasn't afraid she would smash me if something happened and she came down.
Biggest problem I have finding a hang spot is actually finding trees far enough apart with no obstructions (stumps, small trees, etc). Somebody inevitably hangs across a path somewhere, but so far I've never not been able to find a spot.
I'm the only one in our group that sleeps in a hammock, but others bring them for lounging around/naps. I tell them I get first dibs of the trees. In reality as they are setting up their tents I'm setting up my hammock. They get the seconds.