I've also researched this a bit and don't know if all the facts you stated are correct. What I'm finding:
1. There are 2 different ways to extend the mouthpiece to prevent the heat issues. It comes with an extension unit that attaches to the mouthpiece to make it longer (which the manufacturer provides) and a US reseller also provides tubing to add on that gives even more distance to cool off but that is completely their own preference. Most of the
reviews I've seen say the really short is too close for comfort but with the extension it's comfortable but they really prefer the tubing (mind you these guys are used to using this tubing for
vaping other things, not eJuice)
2. I don't know where you got 30 minutes from, most of the reviews I'm seeing say 2 hours. Sounds like somebody might have gotten a defective unit or isn't filling it correctly (will address in #5)
3. I think this is a little hazy, heard from across the room is a little misleading. I can hear my computer fans from across the room but I wouldn't say it was annoying or anything. Most of the reviews I read said that in a room with a TV or in a crowded situation the noise is masked.
4. From what I've read the butane doesn't even touch the vape chamber. The catalytic converter combines the butane with oxygen to create an extremely high temperature. That temperature heats the vapor chamber to vaporize the substance. The butane is destroyed in the chemical reaction that is caused.
5. Refilling butane is a difficult process for some, even on regular butane lighters (I know I've had many issues with a reputable butane lighter, but it's my fault). Most that are experienced in refilling butane say that it is exactly the same process as refilling a butane lighter and the unit actually works great with a large number of different butane bottles.
6. Well this is understandable, I don't know if I would expect anything less.
7. Haven't seen any reports on DOA units but I'm sure I was researching on different forums than Sun Vaporer.
8. I have actually found reviews the opposite for the plastic. I even found a forum thread where the manufacturer chimed in and told about the plastic. The housing is "food grade" plastic or something like that and the internals are "medical grade"? I'll have to hunt the forums down later and reread that. But whatever he said all the experienced vapers on the forum seemed impressed and it seemed to put their worries at ease.
I researched this for about 3 hours last night after reading the initial post and link on ECF (to keep me occupied while ECF was down). There were some people who had issues with the units but just like our e-cig suppliers the manufacturer was quick to answer the concerns and replaced anything that wasn't working as it should.
Most of the really experienced vaper's on those boards said that the unit was now one of the main units in their arsenal. They loved they portability and the functionality. They have more experience with the other type of vaporizers not our nice little e-cigs.
I was looking though and didn't see any way for us to use eJuice in the unit. It seems to me that the vaporizers have sectioned off into 2 types. The type where you have to put in the physical substance and the type like our e-cigs where you use the liquid. I haven't found any vaporizer that could be used for both but maybe I'm missing something.