I have similar concerns about floorless.
I had looked at tarptent...I wasn't sure that I was thrilled with their designs and hadn't heard any huge proponents of their tents.  I was also wondering about the weight if their given weights don't include poles.  I'll give them another go...
For the GoLite... I always wanted one of those, but I'm not stoked about the new MyTrailCo ones they have out and you cant buy the SL5 anymore.  I'm also working on making my own Tipi so I'm not feeling a huge urge to go out and buy one of those.
I do appreciate all of the first hand knowledge.
What turned you off about the designs?
I can say this much - when it comes to a roomy 2p backpacking tent I thought something like the Copper Spur was it. I figured it was a trade-off - low interior space for less weight. Makes sense.
I was skeptical about ordering something that cost so much that I couldn't see in person. However, people raved about them on backpacking/hiking oriented forums. I took the chance and pulled the trigger.
The craftsmanship is great. We came from a Fly Creek UL2, and the difference in space was astounding. The only thing we put in the vestibule are boots/shoes. The packs can fit inside the tent with us with space to spare. Its roomy enough that you can crawl inside it during buggy times and not be cramped at all. I don't think it would be that bad to be hunkered down in it for a day. You can also completely remove the fly and pitch it with just the interior which is mesh with a bathtub floor and enjoy nice weather and be bug free.