Answering your questions:
1. Does the Solomente provide any bug protection when the vestibule is open and the door is unzipped for maximum ventilation?
The Solomente is designed for lightweight winter use. The four closeable vents are backed with no-see-um mesh, but NOT the door.
2. In practice, how breatheable is the Dri-Zone material? Please describe condensation issues and conditions producing it.
I have only tested this in my backyard -- 3 nights (slept in 1 of those nights) -- 48-50F, 75-80% humidity, and light rain in one of those nights. I had the vestibule deployed, door closed, and vents opened each night. There was not even a hint of moisture inside the tent on any of those nights. In contrast, the vestibule flap -- made with coated, non-breathable nylon -- was wet. I also set up my Rainbow tarptent for comparison -- the tarptent's ceiling/walls were very wet inside and out on all three nights (although the floor always managed to stay completely dry).
3. Can you compare it to eVENT, GTX, and/or Epic? [by this, i don't mean "numbers", but rather real-world experiences]
No, I can't compare the different fabrics. However, eVENT is moot since you supposedly can't buy them anymore (although I would surmise that eVENT will perform at least as well -- if not even better than -- SD's Drizone. Epic, as you know, is rain resistant, not rain proof. I tested a BD Firstlight once and found its rain resistance to last about 9 hours (BD claims a more modest 5).
4. How waterproof (resistant???) is it to heavy rain?
No experience yet in heavy rain, but the fabric is waterproof, not just water resistant. I would trust SD on this one.
5. How does it handle snow loading and wind given its pole configuration?
Again, no experience, but the poles are strong -- especially given the "jake's corner" at the foot end -- and the modified A design should be fairly effective in throwing off some of the snow. I believe this tent is good for N. America winter use, except for the fiercest climates where no one would even think of deploying a lightweight shelter.
6. Have you cooked (alc., esbit, or canister gas) in the vestibule in inclement weather?
The vestibule is very small, but is well designed. It will fit a medium size pack, a pair of poles, and boots. I would not want to cook under the vestibule -- unless I am desparate. Even then, I would probably use a canister stove where I can control the flame -- versus an alcohol stove where the flame can flare up.
Many thanks in advance for your time and replies.
You are welcome.