Not to throw a kink in this but while researching 10X42s comments were made about how it is too much magnification for a boat or hunting in the deer woods. I think the comments were that 10Xs limit your sight picture to too small a field. In a boat, less is more as the constant changing of your position makes you constantly adjust the glass to stay on what you are looking at. In the woods you will not see that far, you know the forrest for the trees. In most cases you are not bearing down on something but looking for movement. Not sure if the comments are valid; just something I remember reading. I think if I was hunting sheep or elk where I needed to see very long distances with great detail, I would have 10X42s and a spotting scope.
One of the other things that was mentioned was the use of BAK4 prisms. One review said to stay away from them. Quality was the concern. If I remember correctly: not great quality and everyone uses them. They do it to keep the cost down.
I based my buy on:
Japanese Glass
Good Coatings
NOT BAK4 prisms
Selecting the right magnification
I purchased Cabela's XTs with Japanese glass from the bargain cave. They are 8X42s and work great.
HTHs,
Martin