I don't have experience with one...yet.
I have one on order too, should be here any day.
I got the partridge front to match.
I'll be putting them on an M77 RSI 7x57 as the primary sight.
I held off on this for a long time, looking for something a little more open in design, something like the NECG CZ550 sight.
Haven't found anything like that for the Ruger though.
I toyed with the idea of getting the XS Ruger sight, but I'm not crazy about the idea of drilling and tapping my 1 of 250 rifle for it, when there is a bolt on sight available.