I don't believe Wellington is even available outside Mpls, Chicago and Milwaukee. As a company they do their own manufacturing, sales and installation. They advertise pretty heavily here in the Twin Cities -- they have a local radio weather guy as a spokesman. (Which I always questioned -- I thought journalists weren't supposed to endorse companies.) The wood core makes them pretty easy to sell against. Pretty standard stuff, double pane, low e, intercept, nothing spectacular. Their high efficiency glass uses heat mirror, which is an entirely different topic of discussion on its own.
Go to this link for more on heat mirror.
www.replacement-windows.com/windowbb/vi ... php?t=1276