I've got a couple backpacking hammocks and I know that for me, the materials make a difference. I've got an Eno, but the fabric is very breathable and readily absorbs water. While that's great for relaxing on a sunny afternoon, it sucks when you get any sort of precipitation. My Hennessy repells most side spray, or at least enough not to accumulate.
It's also worth noting that the ENOs don't have a ridge line or anything to support a tarp and it's not an option. Neither is bug netting. You can of course make or buy tarps or bug nets seperately, but it's just another barrier to entry into backpacking.