A DL is awesome for keeping your butt unbitten; that said, it depends on how you sleep. I usually wear at least a thin pair of britches (even in summer). I often put down a layer on top of my hammock, too, meaning I don't have to use a DL hammock to keep my butt mosquito free.
The Buginator will pull against your UQ, but you can keep the bungee cord a little slack to prevent it from compressing the down. It will still create a seal and keep out the critters. The cord will only compress a small area (a ring shape) but inside the ring, there will be no compression because the down will not be sticking out and outside the ring, the net will be gathered and loose, and it will not cause much compression there either.
One thing I have noticed is that our net does hold in "some" heat. When using my Buginator on cool nights without a UQ, I can feel a draft in the area beneath my seat. With a UQ or a pad, it goes away.
Now carrying the Mini Tattoo Stove!
Light weight. Low prices. Great gear.