I am going to compare some Ameriglo sights to Truglo TFOs on my Glock 19. I recently started doing some practical pistol shoots and working on more dynamic situation shooting and have found that in dim light my Ameriglo sights tend to disappear to more of a just black looking sight. I am working on shooting with both eyes open so this has caused me some grief, either I have to close my non-dominant eye and lose some speed or keep them both open lose focus on my front sight at times and lose some accuracy (once again this is for me and my experiences, yours may vary). The Ameriglos are great during a sunny day and that orange sight smacks you right in the eye, but like I said in dim conditions it just goes to dull and blended. Here's pics of the Ameriglo GC-65R-180 rear and GL-212-OR front on Glock 19 in various lighting conditions (I took a lot of pics and chose the ones that were closest to how it actually looks to my eye in person): pitch black (green dot in center) overcast day in kitchen hallway to kitchen, overcast day walking into bedroom with blinds shut on overcast day under the skylight in the bathroom, overcast day As you can see if the light is bright then the sight is great but in dim conditions it really gives more to want. *My review of the TFO will be tomorrow when they arrive (should be in the AM if the UPS guy is on time and installed by afternoon).