As for people who say ah but I don't have to tie mine down ……. any awning is just a big sail and thus any wind is going to rip it off the side of your car eventually if it is not secured down.
Who, like me
The only time I've had to tie down my gunyah awning is when I'm using the extension bit, because it has no poles to self support. Otherwise the poles all lock together and it would have to be a really strong wind. The arms come out from the vehicle and lock into the leading edge, where the poles are. So long as you pull it out taut it doesn't get much flap or wind up.
Have a look in the pic below, you can see the wind flapping the extension (which is just some canvas stuck into the channel on the awning, and then two poles stuck in corners- forgot my proper ropes that day so had to dodgy it up). By comparison the actual awning is fine.
Here's one by itself. The cheap gazebo you can see in teh corner kept on blowing away that day, but the awning didn't need roping down.
Don't get me wrong, I like the Foxwing but its not as "no ropes" as other heavy canvas awnings - that and the need to carry poles separately are its only drawbacks to me (yes, minor things, but I would forget the poles and ropes I'm sure)
You are right about the room, the foxwing offers heaps more and offers rear shade.
I have been looking at them for my next car (which has a side opening tailgate, rather than vertical like my Jeep) and would like the coverage over the boot it affords. I'm still debating whether to go for it or put a canvas awning over the back.