I've never gotten around to buying one, but I have checked out a couple a friend had for hunting (his hunting, not mine - I'm not a hunter).
Beware "Shoot Through Mesh Windows". These (apparently) don't always unzip and you're supposed to fire your gun right through them. It's not ideal to always be shooting through a mesh (though it does help with mosquitoes
). One of my friends blinds had no windows that opened completely to be in plain air.
Also beware shoddy construction on some of the lower priced models - mostly make sure you have a good return policy. In a protected forest one of my friend's blinds didn't stand up to very light winds over its first night out, and ideally you will be able to leave them up for a few days so wildlife has time to get accustomed to them.
That's about all I can offer. Best of luck finding a suitable blind