Hey Dennis,
I guess it's what you're used to... I found the right-angle finder more intuitive to my brain... but then I work with computers so I'm a little different anyway.
Also, I'm a tall bloke and find it really awkward to bend down to the level of my 8" and then twist my neck around to peer into the straight-through finder. I feel like that girl in the Exorcist movie.
Do all finder scopes fit into that standard dovetail bracket or are all scopes different (ie - would I have to modify my Dob)? How much would you be asking?
cheers -- randall