A buddy of mine uses the Hennessy. An advantage of the Hennessy is it's asymmetrical which makes it easier to get a flat sleeping surface. A disadvantage is the design limits which underquilts that will work. Hennessy's are well thought out and the company will support you.

I bought an innexpensive camping hammock off of Amazon and it has worked fine for me. I started out using my sleeping pad underneath me and transitioned to an underquilt. The advantage of using a sleeping pad is you can still set up your hammock on the ground if there are no trees. You will need some type of insulation underneath you no matter how you set up.

I try to avoid camping when it rains, but do find camping in the rain way easier and more comfortable with a well set up hammock than a tent.

I find hammocks way more comfortable than sleeping on the ground. There is a learning curve and you will find dozens of reasons to buy accessories which will increase the intial cost of your hammock.

BTW: If you do decide to try an inexpensive hammock, make sure it's a double size and not a single. Carefully check the dimensions. I'm 5'11". My double sized hammock is plenty long, but my son's single size hammock is barely long enough for me. A different buddy of mine bought a single sized camping hammock on a flash deal for a whopping $15 and finds it to be too small when he's using a sleeping bag and pad in it.