I don't think I would be happy with the UL as my big attraction to this hammock is the weather shield. I think this would help a great deal with the comfort factor. I guess I could get the UL with a weather shield.
A big issue I have with my HH is the air above me is cold because the top of the hammock is open. Many times it is too hot to be completely under my quilt, but if I uncover my chest, my chest ends up getting too cold because of cross-breezes and colder air in the hammock. This makes it difficult for me to sleep. I think the weather shield on the CJH would eliminate this issue. It would help trap some heat and make the hammock warmer as a result.
I thought about getting the over cover for the HH, but that seems like a major pain in the neck. The CJH can be zipped up, or down within the hammock.
I just want to get a better idea of how well this system actually works before I invest any money into a CJH.