Thanks for the replies.
I think you may be right and Polaris might have that name trademarked (and got a little PO'd) as I found a yet to be posted news item from Ideal stating their UltraWeld will now be know as UltraTite:http://www.idealwindow.com/NewsStory006.html
On the same site, I also saw that they are reporting the .02 AI number as accurate:http://www.idealwindow.com/Air_Infiltration.html
I usually prefer going the extra buck on a better item for the long haul but after seeing the window with my untrained eye and comparing the specs, I really want to know why the Ideal window is at its price point. We'd like a window with "more glass" and we've seen the OKNA 500 and the Soft Lite LS and Bainbridge. Those are all very nice windows but the price of the Ideal is about $200 less per window installed and I am trying to understand why. Obviously I am missing something. Is there something about its structure that is suspect? Having the less than ideal spacer isn't a deal breaker for me. The installer we saw it at seems pretty good as they are family owned, have been in business for many years and they get great reviews on consumer sites. They also offer the Soft-Lites.
Having a BMW of windows would be great but when a perfectly acceptable Honda is available, going the extra buck might not make sense for us in this case. I am just a little unnerved that I cannot find any real world reports about this model. Everything I have read about Ideal is dated and only about models they no longer produce.