I've got to give some props to Mueller. I've got two of their scopes (8.5-25 x 44 AO on my 22 Bolt rifle and a 4-16 x 50 AO that recently lived on my .45-70). Took the .45-70 out last month to go pig hunting and noticed some clear drops on the reticle inside the scope. I sat it aside an ran a Primary Arms 1-4 for the hunt and just got around to sending the Mueller back for service. It shipped out on the 4th and with no word back this Friday I was going to give them a call to make sure that they'd received it. Before I got time to give them a call, my wife let me know that I'd received a package. Was very surprised to see not my scope cleaned and repaired, but a brand new one.
Turn around time of a week for a warranty repair and received a new scope. I'm pretty satisfied with them.
No, they're not Leupold or Nikons, but they're not bottom of the line either. For a couple hundred bucks, they certainly do the job for me in the farm gun / plinker category.