Five years of ownership
I'm a big Clark fan. I've never slept in a HH but have napped in one.
I've had three different models - the Tropical is my newest.
All clarks are best for winter hammocking - the mat/insulator stays put and is the simplest/lightest solution to stay warm. I too have tested mine down to 20* - with a 15* Mountain Hedrware (synth) bag.
I think the tie downs are easier to manage than the HH.
I can't sleep on the ground anymore...
Email me if you need to know more