I have the Federal Concepts one fitted to my Noveske (GM nozzle). It's much better than the RATech as it doesn't need wedging with a second Allen key or screwdriver to adjust. Easy as hell to fit, spot on consistency and it performed flawlessly over the weekend. Just remember to add a little threadlock to the grub screw to keep it from drifting and you are good to go. As far as I can tell, and having used a Jaeger Precision downgrade valve before the FEDA came back in stock, the JP will be decent too, but it looks like a direct copy of the FEDA which Federal Concepts took the time and money to develop, so if nothing else, I'd go with the Federal Concepts one every time to support developers.