I really love my MW3C UQ and it works very well on my Warbonnet Blackbird. The only problem I've had is that sometimes the uq falls of of the foot-box.I think it would be easy to remedy with a cord up to the ridge-line or a mitten hook sewn on the hammock body but, the problem is so infrequent I haven't done anything about it yet. I'm considering making a hammock without a bug-net for winter use to make adjusting, or putting the UQ back on, easier from inside the hammock.
I'm not sure about how the UQ would work with the stock Hennessey bottom entry but I'm guessing that it would be a pain. You may want to consider a zipper mod to your hammock or getting a different JRB UQ designed for use with the Hennessey slit.