Rick,
Since I'm backing up to 45 yds+,I wanted something with pins that take up even less of the target than my Spot-Hogg did. The Sure Loc Razor pins are amazing for a clear sight picture.
I put it on a Sure Loc Challenger Ultra with the armored 3rd axis mounting block and the precision is awesome.
I still very much like the Spot Hogg sights, I just wanted to see if I could get even more precise in my aiming.
I bought myself 9ft. of extra fiber optic and cut it to lengths so I couldn't care less about bumping one of the exposed fibers on the razor pins and breaking it.
The razors are so thin and when set exactly right thatit's almost like you have floating aiming points, they take up almost nothing on the target. It is just less clutter to look past.

I also wanted to start thinking about scope classes and indoor spots so the Sure Loc is a natural choice for this year.
Nothing against Spot-Hogg that's for sure! Terrific sights and I would recommend them to everyone, (Not giving them up on my hunting bows)
I just felt that the Sure Loc combo is a better fit for myself and what I am looking for in a sight for longer range shooting.