First, are you talking about the old Aetec, or one of the new Master series? The old line has an excellent reputation, and all that I've looked through and shot have been very good. I know one fellow that has more guns than he could ever shoot, and has Aetec's on just about every one of them, from .22lr to .375H&H. The Aetec does offer long eye relief for a hard kicker, compared to the specs for the Mueller's I've read about. I have no experience with the Simmons Master series, and the reviews I've read have been so-so on them. Lots of people on here love the Meuller's, but I've never even laid eyes on one. If you look, I'm sure you can get one of the old line of Aetec's either NIB for $150 or less, or you can find a good used one for under $100 or so if you look hard. Not sure how that compare's with the cost of the Meuller's.