Yes, they are a bit finicky to set up. The first one I bought worked flawlessly in my M700 trainer. However, when I tried to use it in my Surgeon 591, it didn't work properly. Firing pin wouldn't drop. Ended up having to change out the spring that holds up the sear for a lighter one. Same thing on the second one I bought, and in my second Surgeon 591. The third one worked fine... at first. Put about 1200 rounds on it before taking it to the GAP Grind. It ended up failing on me on the first day in the middle of a stage. Luckily G2 switched it out for a Timney and got me back in the match before the next stage. When I got home, I switched out the spring on that trigger for the lighter one and it started working again. It's been working fine since, but I'm hesitant to recommend it now.
I'm waiting to try the TriggerTech 2 stage and the Timney 2 stage when they come out.
That's funny...I'm having the exact same issues with the Calvin Elite also with Surgeon 591 actions. I tried the 1st one(Rem 700 version), trigger wouldn't fully drop, sent it back. Timney sent me the "McMillan" version, that didn't work either so I sent it back too. Back to the Jewel that I can rely on.
As far a Cadex goes, I tried one on a display rifle and it was the worst trigger I have ever tried. It actually felt like a 3 stage from how much creep there was. This trigger may have needed adjustment or to be set up properly but it was terrible.
If money was no object I would like to try a Bix n Andy.