I had a globe front site on my TC Renegade for a while, along with a rear peep sight. The globe front sight is a phenomenal target sight. My absolute favorite was the circle insert, and I used this with an NRA black circle target. Everything self aligned in a series of circles. A close second was the crosshairs insert. I found a globe site is best used with either a very small peep sight aperture (small enough to only allow view of the insert in the front globe), or very large to allow light around the entire front sight. When the rear aperture just barely allowed the whole front sight into view, it made my eyes bug out. I later found that a globe front is very poor for hunting unless you are in the wide open with great light. The problem is once you get about an hour from sundown, the front insert becomes a blurr, and it isn't long after that it turns all black.
What I went to was a large rear aperture, I believe a .125" opening. It is the Williams low light with brass ring. I do not know if the brass ring does anything or not. The front I gave up on the globe, and installed a plain old post, I forget the width. The face of the front, I painted first white, then bright orange with paint markers. This set up will get me pretty close to the end of legal shooting time unless things get very dark, like in thick forest. This set up doesn't give up all that much precision on targets either.
