I love my Hennessy. I have the larger model of the Asym, and it has served me very well. Up in the Bigelow Col, while my companions squeezed onto the platform, I easily tied off to two trees next to the platform and had a very pleasant night. At (the former) Spruce Brook Shelter, I curled up inside with the (at the time) latest Harry Potter while it poured all night. I stayed warm and dry using the matching siltarp, pulled low, plus good tension on the hammock side tie-offs to keep it from swaying out from under the tarp. My gear stayed over in the shelter, but would have been fine directly under the hammock.
Getting in and out is easy once you're used to it. You basically stand up under the hammock, poking your body through the velcro opening, then sit. Draw your legs up and in, and the opening will close itself up. The tough part for me was maneuvering once inside, as when I first sat, sleeping bag (and anything else) slid down and was now stuck under me. You're so much smaller than me, though, that shouldn't be an issue for you. And once you're "in position" the thing is incredibly comfortable. You can tie the tarp low if you expect rain or wind, or leave it higher up (or off) and get a view right out from your cocoon.
One limitation is the amount of gear you can bring inside with you. Anything in the main space is going to slide down and end up under your body as you sleep. The little mesh pocket that hangs from the "roof" line is good for glasses & headlamp but not much more. Also, you're limited in what sleeping positions you can use, due to the shape and slight sag to the hammock. If you lie on your back in the "right" position, and have tied off at the right heights to the trees, the hammock will go almost rigid and close to level. Practice to learn just how much difference between the height of the tie-off of the foot and the head.
The most important limitation is as Ryan noted - it does not work with sheep. You have to have trees available, and at approximately the right distance apart. It's a gamble at campsites with platforms, and at campgrounds. Backpacking it's wonderful, though. No worries about setting up with a root or rock poking into your back. Watch where you put the stabilizer lines, though: if someone walks into them while you're inside, you're going for a ride.
ps - don't tie it off incorrectly, it hurts like hell to get inside and have it fall down.
