In all honesty I have found the differences to be there but quite minor in most applications. I have used the Tak prism as well as some cheap prisms, Zeiss 34mm prism, some generic 2" mirrors and the Baader 2" dielectric. The cheap prisms are quite obviously lacking when up against the Zeiss.
In the end I have settled on the Zeiss prism for almost all of my viewing as I now only have 1.25" eyepieces and also intend to get the Baader MkV binos when my bank balance recovers. So for me the very short light path is an important factor as well. I can live with a little colour induced by the prism.
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