I'm probably on the conservative side too. I don't like period instruments much, but I hate things like jazz trumpet, and modern percussion. (But then I personally hate Jazz, period!) I don't like cymbals (they make me tired and give me headaches ). And I hate the trombone unless it is in the background in full orchestra (though I sometimes use it there myself). So for me it would depend on the particular case. I LOVE Arthur Fiedler's orchestra rendition of Bach's Chaconne--trombone (background! ) and cymbals and all (I think it was written for solo violin, and I don't think it is suited to that instrument at all!). I think Fiedler's orchestra arrangment of the Toccata and Fugue is great too. But I would feel like screaming if I heard a cello suite on trombone! So anyway, in some ways I'm a fussy person.