Mueller doesn't advertise and goes by word of mouth. If you want reviews from gunwriters and other publications (then Meuller's site) here's a couple...
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Smoking Gun Shooting Team, Shane Hurkmans
The scope I tested was the Mueller 8.5-25×50 AO red dot. Here is what I did in my shop with the scope. First I put it on my bench 22lr rifle and sighted it in. then I shot the scope for square. This test is five shot groups, then I turned the scope left nine clicks and shot five more then up nine clicks and right nine then nine down. When the last five were right in the same place the first five were not to bad for having five miles an hour winds . When I took the scope off the 22 and put it on my 375 H&H. I took the rifle and put it on the bench that I use for test actions in a vise, strapping the gun down and the butt of the gun up tight against a block wall so the recoil of the gun would not go back. This way the scope has to take all the force of the recoil. After 100 rounds from that, I shot the scope for groups on the 22 again. Then I put it on my 50cal BMG and shot 20 rounds through it. Then back to the 22 for the final test to see if it held center. After this test, I think this scope will hold up to just about anything you can do to this scope. Most scopes in this price range would not hold up to all this.
Dear Mueller guys and gals,
I have to admit, I was skeptical. Life is too short for bad optics and ruined hunts, but my pockets aren’t deep enough anymore for the super-premium scopes with their price tags of $700 and up. I first discovered Mueller optics on eBay and then did a lot of searching various websites for reviews. I even contacted you at one stage to talk about coatings. Finally, I just did it. I bought Tac II to put on a Browning A-Bolt in 338 Win.
The image quality of this scope is superb. Color and light transmission are equally superb. It’s well made and well finished. Best of all – it shoots, man does it shoot. Check out the photo from my efforts at the range at 100 yards. This group size is phenomenal for a hunting rifle. Even more impressive is the final shot, the lowest of the three – I adjusted the scope ¼ down and ¼ left and guess what? That is EXACTLY where the Tac II put it – and if I hadn’t moved it, the group would be even smaller again.
I have a couple of mid-range Nikons and a top of the range Burris Black Diamond – they’re good scopes, but this one is better, and much cheaper. My buddy who witnessed the group has a number of high-end Zeiss and Leupold scopes – he felt the Mueller was equal to or better than anything he has, and now he wants one!
I am convinced and very very happy. Thanks.
Tim
http://www.snipercentral.com/muellertac.htm
http://scopesguide.com/Mueller-Optics-overview.html
Would I rather have a Zeiss Conquest? Certainly. But not for awhile. This sun shield (Mueller) costs $14.00. The Zeiss costs $58. They both work. And also find a Conquest or most other big dollar scope with the lighted dot. That is a sweet feature in early morning and late afternoon hunting.