I'll chime in. I got one 6-8 months ago and it has sat in my garage in the box until I mounted it a few weeks ago. My son and I spent a week driving around in Texas last week and camped using it a few nights. My prior experience with tents has been fairly inexpensive ground tents, so I really don't have anything to compare it to.
The quality seems good for what clearly seems to be a mass produced Chinese product. It came in the box I suspect it left China in given the labeling and I suspect bigfoot is just the middle man. The packaging was minimal and there were some scuffs on the top of mine which I'm sure would buff out if you were so inclined. For what it is worth the one page instruction sheet that came with mine shows a maggiolina tent in the pictures, so I wonder if they are not made in the same place.
Mounting was simple although on a FJ cruiser with the gobi stealth somewhat fiddly as there is little room for hands and wrenches. Basically we pushed it all the way to one side and snugged it then over to the other side and snugged it then centered and tightened. It mounts just like everything else that mounts to rack cross bars. The hardware is decent/good quality stainless.
It opens and is ready for use in seconds. Closing is a little more difficult unless I'm doing it wrong, you have to go around making sure it's not protruding as you close the case and tuck it in, still only takes a couple minutes.
I don't really see any negatives relative to other hard shell tents except the ladder may be a little short. My unlifted FJ with 31's is about at max height for the ladder. We had decent weather with only light rain and it did what you want a tent to do, kept you dry gave you a place to sleep and as a bonus you are off the ground.
I would like to see it next to a maggiolina especially after seeing the maggiolina on the instructions that came with it. Compared to the price of other similar tents I thinks it's a good deal and would buy again.
I will add I spoke with I think his name was Scott Pryor at the company and he was very helpful and nice easy to deal with, so that is another plus.