Gentleman, I have 4 Fostech echo triggers for my various AR-15's and 1 Franklin Armoy for my SBR Scorpion Evo S3, and a Franklin AK Bianry trigger for my RPK, and I can tell you for me they are worth it esp for the "2 shot function". yes I can mag dump them at a near full auto rate but for what the bianary trigger is designed to do I rather love it. As far as the FRT type trigger go I cant comment on as I dont have those. Here is a short vid of my Franklin Armory trigger in my RPK
One for my AR