I can spend more time in the rain in comfort with my hammock setup than I could in a tent. My tent is a small cramped one person tent. There isn't much room to move around. I can only really lay in one position. Sitting up is not good for me without a backrest. With my hammock setup, I could lay in the hammock comfortably, I could easily sit up to read or eat. My tarp is much bigger than my tent, so I can even get out and walk around, cook, etc. Of course that all depends on how the tarp is set up.

I have never used a Hennessy, so I am not sure, but I think the sitting up would be difficult. Also, the Hennessy has a much smaller tarp, so the advantage of getting out of the hammock to cook, eat and read under the tarp wouldn't be there.

I would recommend making a test hammock to see if you like hammocking. If you go to Just Jeff's site, you can get some good info. On his tarp page you can see some different ways to hang a tarp to get the covered front porch for lazy rainy days.

It is much easier to find a spot with a hammock than it is a tent. You must find a flat clear spot to put up your tent. With a hammock you can hang on top of many different terrains. A side of a hill is not a problem, and could be a blessing. Hanging over rocks is fine. If there isn't a place to hang, like stated above in Nebraska, you could easily go to ground. My tarp becomes a tarp tent with my bike holding up one side.