If you don' t mind spending a little extra $$$...
Double Bull blinds are the way to go. Wind flap
is definitely not a problem. I' ve hunted
turkeys, here in Iowa, in 30-40 mph winds.
Like most other things....you get what you
pay for....and DB blinds are worth it[:-].

As far as hunting whitetails, you will definitely
have to " brush" your ground blind in. Mature
whitetails will pick your blind out instantly if
you don' t.

Here is a picture of one of my blinds brushed in
while hunting whitetails in the SW. It is set up
on a waterhole.