I have both a Hogback and and MLD SuperMid. I love them both, but if you want a floor and full bugnet to fit 4 people, the Hogback is the way to go, at least in my experience.
The SuperMid is spacious enough for 4 people, but only if you don't use the InnerNet. My SuperMid is great when I take my two boys -- they dig the no floor thing. When my daughter comes along, she doesn't like bugs, or even the thought of bugs crawling on her at night. But the Mid/InnerNet will only fit three comfortably.
At 65 ounces, the Hogback gives you truly enough space for 4 with all the advantages of a typical tent. It just works.
My two cents.