IMEO, the TruGlo's leave a lot to be desired. By design, the fibers are too well shielded from light entering from the side. I would estimate they are 1/3 the brightness of the Williams offering in all conditions.
Thanks forrest. Well, just decided on the XS Big Dot with tritium center for the Shield. (second Shield coming)They are basically the trijicon HD with two major differences: the ring around the forward tritium lamp is NOT photoluminescent(meaning it doesn't glow after a light is shone upon it) and the rear lamps have white rings around them instead of black.
I just put trijicon HD on a compact pistol and I like them. They show up well in all kinds of light. Looks like these ameriglos are just a cheaper option. The finish looks a little different and the rear sight is not serrated.
Ameriglo has some pretty interesting other options as well. Check them out.