Yes, I've had Jewells. The first prototype before they were out to the public.. very nice. First production ones. Nice.
Then I suggested them to another and a buddy said, they are not worth a flip, teh pull weight changes from shot to shot.... I says no....
And then I buy a new one... and yep.. shot to shot the weight changed.
Never seen or pulled a 1 pound crisp perfect bolt gun type trigger in an AR with a single stage trigger. Had a lot of folks proud of theirs though and when I felt them, they were far from good but miles ahead of factory....