Nikon Monarch Gold 1.5-6 w/German #4 reticle on a CZ 550 Safari, laminated stocked .416 Rigby. Worked great for Buf in Africa.
Zeiss Diavari C 3-9 w/"Z" plex reticle on a Whitworth Express .375 H&H. Used it for plains game.
I wouldn't change either one as I find them perfect for my use.