I have two Mueller scopes, the 2.5x10 (I think it's a 2.5x at lowest setting) and the 3x9. Both are the Sport Dot scopes with the illuminated dot reticle.
The 3x9 has been mounted on and withstood several shots from the recoil of my son's CZ 375 H&H Mag, which speaks of its shock resistant ability. The 3x9 has also been sent UPS from the east coast to Arizona for a coyote hunt. When I took the rifle / scope out of the box and checked zero, it was dead on and I didn't have to even unscrew the windage or elevation caps.
The 2.5x10 has been used on a 6x45 and has held zero really well, and has accounted for numerous coyotes and bobcats.
The Sport Dot reticles are really nice in my opinion, making it easier to get on target quickly due to the dot reticle. Mueller scopes aren't high priced or don't carry the high-brand names, but they are solid scopes for the money - in my experience anyway. I know that some on the forums have had different experiences than mine, but I have never heard a bad word about their customer service.