I have a HH Explorer Deluxe, very comfy but gets cold at night if you dont have a camp mat (thermarest is fine) under you. The problem with that is the mat tends to shift around easilly, so if you move, the mat slips out of position, and when you all wrapped up in a sleeping bag putting it back is a PITA. I have an underquilt (simple as it sounds, quilt you hang under you, to keep your arse/back warm) but not had time to try it out yet.
The tarp seems quite small but does provide good coverage, and if you dont expect heavy or driving rain you can set it up high to get a nice view out. Ive actually taken to setting mine up on a separate line to the hammock supports, means i can put it up first or independant of the hammock so if it raining i can get shelter without having to pull the whole hammock out of the bag.
Some pics of my last trip here...
Stealth camp by dickyelsdon, on Flickr
Generally i do like it tho, comfy to lie in, dead easy to put up, keeps midge out and rain too. Another thing to consider is while it is smaller than a tent its still pretty bulky compared to a bivvy bag, so not always my first choice.