Gil,
Not to argue with anyone's opinion, because there are situations where every one of these blinds will work with whatever bow you shoot. I had an extra tall DB, and now have a Baronett grounder 350 and a Baronett Big Mike. For me, the bigger footprint is more important than the height(up to a point). Any of them seem pretty good trying them in a showroom. I don't have to stand up to shoot, but the windows do need to extend low enough that I can shoot sitting or kneeling. I found that my shooting form barely lends itself to the Big Mike footprint. I extend my bow arm with arrow nocked and then draw the string. I can do that in a Big Mike but I have to first move my chair out of the way and then move back to the back wall-unless I was there already. I've not had to do this with another person in the blind, but that would make it more difficult. So, depending on your shooting style imagine doing that and also canting your 68" bow enough to clear the top.....a lot to think about when there's a critter in your window! I've never seen a Hidden Hunter-it's profile would seem to lend itself to a longbow shooter, but-in an excited moment, I even put the tip of a 62" recurve through the top of my Grounder 350! My guess would be that a 66-68" bow would preclude using a pop up blind with confidence. I'd think a brush blind custom built on the spot would be better.