So PSA had a deal on these for 189 with a LPK, so I figured I'd try it. And I'm very happy I did. Installed it in a Spikes Tactical receiver.
This is the smoothest and lightest trigger I've ever shot. I have experience with Timney, Geisselle, and Rock River Arms' 2 stage, as well as good ol' reliable milspec hammer bars.
The hiperfire is a single stage, so it doesn't have that harder pull just before the break that makes the hammer fall, so you don't do the "prediction flich". I would not recommend the lightest setting for a hunting application, cuz it's actually scary light. Good news is it comes with 3 sets of springs to adjust the weight of the pull between a claimed 2 (I think it's even lighter than that) and 4 pounds if you wanna beef it up a little if you're hunting in the cold and need gloves.
Installation is mostly standard fare with the exception of the 2 "lever springs I call them" and took me approximately 45 to put in.
Here's their promotion you tube video, and I will add pics of my kit and installed in the lower.