Pleiades - you have a GSO-Diagonal? Cool! I needed a good 1.25" Diagonal, and was figuring I'd get a William Optics RACI Dielectric one - which is what I use in 2" format on all (except my Newtonian) my other scopes. But the 1.25" GSO Diectric 99% Reflectivity model this time caught my eye. And I happily found out it was absolutely excellent! It's fit and build was every bit as good as my WO 2" dielectrics' in this smaller format.If I ever have need for another 2" 90° diagonals - it, too, will be a GSO. Guan Sheng Optics is putting excellent products out there, and at far less cost than the other Big-Name companies. That's win~win in my view. Enjoy!