Always looked enviously at these NRS Wings and MSR Zings, but never opted for one...
Back in the Fall we got one of these massive shelters from Eureka
Eureka Northern Breeze Tent - Camping Tents
in hopes of using it during late/early season trips in foul weather. We have not actually field tested it yet, but setting it up and playing with it in the yard I feel confident in saying it can and will hold up to some serious wind if guyed and staked properly. One bonus is the fact that all four side panels come down to complete a full 10x10 room in face of serious adverse conditions or cold...one drawback is the weight...it is F'n huge and heavy to carry around, but would provide true 4 season protection (i hope) during rain, snow, wind etc.
What we currently use is the Kelty Sunshade...
saw these up at Telluride Bluegrass a few years back and had to have one. Finally got one and it has served us very well during some hot summer trips the past few seasons. It is a little more cost effective than some of the others, and is also free standing. I have seen this stand up well to medium winds without any guy lines, but have heard horror stories of these just getting mauled under high wind conditions...another draw-back is also weight, as it weighs in around 18 pounds i think...heavy. but not nearly as bulky as the Eureka. This one is good for lounging, but would not be as great for a kitchen as the room under the shade is angled and limited.
Curious to hear about what others say as far as the wing/zing...this is all I got, but both options will/do work for us.