I have 2 of the 4-12 Premiers on my Beeman R7 and BSA Supr Sport air rifles. They are pretty popular among some of the moderate power spring air rifle users. They're supposed to have as good a guarantee as Leupold. And remember spring air rifles have a nasty recoil cycle (forward and back) that can eat up scopes made for high recoil firearms.
I'm happy with mine. I really like the close range adjustable objective.
HTH