PMFJI again,but I have also heard stories like that. The ones I heard pertained to tests on Mt. Washington in NE, where winds were well over 100 mph, and other tents were completely demolished. My sense is that the 2RS [or 3RS] are better than most others in the wind. Some heavy duty 4-seasons might be stronger -- I have no way to compare. In the heaviest winds I have experienced [maybe 50 -60 mph?], I did stake down one of the corners on the windward side. Normally, I just use three stakes. If you set up the tent with the wind on the side, It would not be as wind proof, just like any other tent. The ability to tighten the tent without getting out of your sleeping bag is also a big help.
Re service and quality, I belonged to the old CompuServe backpacking forum some years ago, and a number of the core members got Stephenson's after the endless raving of one other member and myself. The only problem I recall was with one member who wrote for an outdoors magazine. He called Jack to ask for a free 2RS to test and write up. Jack told him he doesn't like reporters, and if he gave out free samples to reviewers, he would have to raise the prices for people he does like. The "reporter" ended up buying one or more Stephensons and loving them.
That said, I can guarantee that if you call Jack wanting something fixed or replaced for free that Jack thinks is your fault, you will get a strong lecture, not free service. :-) They are not North Face or REI. However, if you don't believe that every company owes you the world, I think you will find them very reasonable. I have. They will fix anything that is their fault for free, and usually take back anything that has not been used unless it is some weird custom design that you have asked for. And if you tear it, you pay for the repairs.
Re an earlier question on mosquito nets, note that "2R" means the two-person "regular" tent, with an inner lining between the hoops. This has NO side windows. Jack does not really like side windows. He thinks they screw up his wonderful convection ventilation system if you open the sides. I think he is nuts on this issue. The tent with side windows is a "2RS." The side windows cover most of the tent between the hoops, and are covered with mosquito net. There is a narrow solid nylon strip at the top. I normally tie up the outside flaps on top of the tent in good [but buggy] weather. Then, it is almost like an all-net tent. You can see the entire sky. If you get a light shower or wind and dust, you can just zip up the flaps in the inner lining. If it starts to rain or snow seriously, you have to get out and either stretch out the flaps like awnings or zip them shut. This takes only seconds, and is MUCH easier than rigging the outer tarp on most tents. IMHO, the side windows and awnings are one of the best features of the Stephensons -- something no other tent has come close to.