Yep, another vote here for the Double Bulls. We have the one a step down from the Matrix. Not quite as roomy, but doable for sure with some practice while killing some time.
I really liked being out of the wind, and the fact that it warms up pretty well inside once the sun gets on it. My first time using it allowed me to actually sit in one spot for almost 7 consecutive hours, which beat my previous record by about 5 hours!
I recall a member of this site who had made his own hay bale style blind that was amazing and had written it up really, really well (I'll try and dig it up). I've also wondered about picking up a couple of cheap tents, adding some mesh and shooting ports and spray painting the exterior. Maybe that's the cheap azz Scotsman in me though!
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