I own a Hennessy hammock (A-sym expedition) and I out of the times I've used it I've rarely been able to get comfortable, (I've been cold, had my feet slip out of the bottom, etc.) and the elastic lines from the ground to the tarp are torn from tying around rocks instead of stakes. Maybe I don't know the best way to set it up, I'll have to try setting it up again this summer and see what I need to do differently.
But anyway, I really bought it for backpacking and don't mind the little extra weight my tent and pad add when loaded on the bike because I am more comfortable sleeping. I also bring a small tarp for more coverage or to wrap around the bike when I sleep.