I have a mint condition Everbrite diagonal, the 1.25" variety. I bought this one from fellow Astromarter Ed Hillyer three weeks ago. As a former optics dealer for a major distributor, he hand-picked this unit out of several he had in stock. Others he tested were in the neighborhood of 95%. This unit tested at 100% collimation, and has the characteristic fine, fine mirror. If you want the best diagonal made in this size, apparently this is it!
I've put myself in a position that I need to come up with money quickly for another project. I spent $200 on this very special diagonal. I'll sell it for $185.00 shipped to the lower 48 states. Sorry about the bad picture, but you can get the idea of the beauty of its mirror.