John, I have used both the 2" BBHS Sitall mirror ClickLock and the T2 Zeiss extensively and now also have a T2 Maxbright. The BBHS 2" is very very good, giving an excellent view that to me seems brighter than any other ones I have tried. Seems to be better on scatter control as well.
If you're not in a rush to spend your dollars I am happy to let you try mine to do a comparison. This diagonal also has external collimation via push/pull screws...
Were it not for the shorter light path needed for binoviewing I would just have the BBHS 2".
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