Possibly stronger, lighter, more waterproof, better vented, bigger vestibule, more rugged hardware, etc.

The cheap tents I've seen like that would have a very small overhang so that any blowing rain would blow right in, poles were fiberglass instead of aluminum (meaning heavier), etc.

Keep in mind that in nice weather, you don't need ANY tent.

And I have seen some nice high-dollar tents torn up in a thunderstorm on the plains in the middle of summer.