I have this same tent. We have only camped in it about 7 days, but really like it. I have it mounted on a Gobi rack, works really well. We use the annex for a dressing room and puppy bedroom, its a nice addition.
As far as quality, it seems pretty solid. I plan to add a thin foam pad under the stock foam sleeping pad, for a little extra comfort and insulation. I will tell you, mine gets easier to pack and unpack every time I use it, especially all the zippers seem to be getting broke in. Also, the more I set it up, the faster I get at making camp, you figure out a good routine to setting one up.
One thing I was happy to figure out, after a month of rainy weather driving and being packed on top of the 4runner, I opened it up last week and found the tent and sleeping pad to be very dry. This is awesome if you plan to keep it on the roof full time. I have taken mine off for winter, to save a little fuel mileage, even with Billies front and rear I can feel a difference in the handling of the Runner with out the tent up there. Anymore specific questions, feel free to ask