It is always interesting to hear what other people are looking for in a shooting house. I agree the window is probably the backbone of a good blind. I had the shadow hunter windows in our first house we built in 2009 pictured below. They aren't airtight but it did allow just enough air to flow so that the windows didn't fog with a heater on. This house is in a perfect location and the deer usually couldn't get our wind due to a pond behind it. They did a very good job but needed to be replaced this last year. I tried
http://deerviewwindows.com and they are nice but are single pane windows and fog with a heater. I love this house and spend almost 2 weeks straight sitting in it during deer season. This spot consistently produces opportunities at the biggest deer in out area. I am buying double pane windows which should solve the fogging issue with a heater. My buddy owns a window company and put them in his and it solved the fogging with a heater.
We have rednecks also and those windows are a pain in cold weather, they fog like no tomorrow. They are nice and fill a niche in some of our spots and would be perfect if we could get around the window fogging. In mild temps they would be perfect. They are absolutely scent proof with the windows closed in my experience. In really cold weather the windows fog even without a heater. They are nice blinds but aren't perfect. Perfect really depends on your needs I guess. Lots of nice blinds/houses out there, which is right for you depends on a bunch of factors. I am right there with SWAT as to what works best for us. After 17 shooting houses on 4 properties over the last 10 years we have settled on a 5x6 house we build that has double pane windows as being close to perfect for our hunting. These houses are geared around sitting all day in cold weather during gun season and muzzleloader.