There are a variety of things that make hammocks uncomfortable for those for whom they are uncomfortable.

One of the harder ones to deal with is the hard line the hammock seems to settle into where the force of the load path becomes uncomfortable over time. Some people aren't bothered by it and can even sleep on essentially a 2 inch wide strap. This thing still seems to have the hard line, but they have altered the orientation, and added a mattress.

This hammock ads a new problem, lack of outbound support for head or feet, or for tall people.

Other than those problems this one has the usual old ones, like lack of correct position, position flexibility, and cold.

I'd still like to try one.