I recently saved up enough cash for a Hennessy Safari and an Expedition for the girlfriend. I looked at a bunch of different hammocks and settled on Hennessy just because of the "all in the one" package. As a big guy, the Safari appealed to me - it's very roomy. After solely using tents since I first started camping (sleeping on anything from the ground, pads, air beds, etc.) I don't think I will ever go back - my first night in a hammock was the best night of sleep I have had in a long time. It's decently easy to set up though I'm still fine tuning/experimenting with each night out.
The Hennessy line is nice for the "hammock, netting, tarp, straps" combo - You don't need much else besides insulation. However, I did pay more than some of the other hammock options out there. For me, the quality is there and the price seems worth it. That said, the DIY side of hammocks is huge - Everything from tarps, underquilts/top quilts, hammock suspension, etc. is up for customization. My next hammock will be a DIY without a net for the winter. As stated above, hammockforums.net is an immense resource for anything hammock.
For insulation, I ended up just rigging an old sleeping bag as an underquilt which has worked fine for anything above 40 degrees. It was pretty easy to rig up (I ended up cutting/sewing an entrance slit for bottom entry, but it really wasn't needed) and makes a big difference in comfort. The above comments about wanting either an underquilt or a pad are spot on.
I would really consider what you want to use it for (car camping, hiking, extended trips), how much you want to spend, and the temps you'll be sleeping in. The Safari is great for car camping, local trips - places where I'm not backpacking or going very far. I can increase the comfort factor without having to stuff it all into a pack. I have yet to attempt lugging that thing on an overnighter because the hammock plus the tarp and UQ takes up a lot of space in my bag. Most other hammock/tarp combos are smaller and much more space friendly for hiking. Add the insulation and, like sutured said above, your not that much different than a light tent setup in terms of weight. Except for comfort - that's a whole different story

. Down insulation helps with packability and warmth but is typically pretty expensive (I'm just out of college, so everything is expensive :grumpy

. There's so many options out there - the multitude of hammock setups is big enough that you should be able to find something that would work for you. You could be setup with stuff you might already have - an old or unused tent tarp, old sleeping bag or pad for insulation. Add a hammock and your set.
Weather makes a pretty big difference in comfort for me - I've only slept down to about 30. What you use during a 60 degree night may not work for you on a 50 or 40 degree night. Typically, I always have some sort of underquilt - I add or take away varying items inside the hammock (Everything from not using anything on warmer nights to using blankets, sleeping bags, warmer clothes for when it get's much cooler).
If your unsure, maybe look for a local option? I was able to find a local retailer that had ENO's in stock - I bought a DN and liked it so much that I ended up buying the Hennessy. If you end up not liking it, you could return it (not that online returns are all that bad either) no harm done. I highly suggest checking out the links mentioned above for more info as to what could work for you.
Good luck :thumbup: