I installed the Apex FRE on my Gen4 G19, along with their spring and the bearing they recommended on the website. I also have the 30274 ejector in the gun. My gun is a 6/13 production so it's brand new. I put 150 rounds through it today and had strong ejection - no brass trickling out over my weapon hand. However I did have some BTF. To be honest, this doesn't really bother me all that much. As long as the brass is coming out and I don't have a jam/malfunction I'm happy. It is aggravating that it doesn't work like it should, but as long as the gun stays reliable then I'm happy. I think I had between 3-5 BTF but wasn't really keeping count.
"As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind... Let your gun therefore be your constant companion of your walks."