Summary: I bought these binoculars after studying reviews for a few weeks and for the price, I really can't complain! I'm using them primarily for astronomical purposes. PROS: Great price (I found prices ranging from about $250 down, and this was the best price I could find); solid construction; great optics. CONS: The focusing knob isn't the smoothest..
Summary: For astronomy, these waterproof binoculars have clear stellar images all the way to the edge of the field. The field is a little smaller than the similar Nikon Action Extremes, but those don't have unblurred pinpoint star images at the field edges. I chose these for astronomy, being the most powerful binos I can hand-hold at 10x. The coatings seem excellent, and the weight is reasonable. They also have very nice, solid pull-out plastic eyecups instead of rubber.
Summary: These binoculars are really well built and comfortable to hold. The Optics were perectly collimated (as far as my eyes could tell) and the image is nice and bright. I use then for astronomy and the image is sharp across the field of view. Why only 4 stars ?
Summary: Good quality 10x 50 binoculars like these are perfect for casual star gazing. We used this to replace our old pentax binoculars that had been stolen. Optically these are good, hard to compare as I have not used the two side by side. It is v hard looking at the Pentax website working out what makes these more special than the next ones down.
Summary: Well worth the money. Well made, they feel solid in the hands. Robust enough to sling in the back of the car. Ideal for casual astronomy or wildlife viewing. Only gripe is the lens cover which does not stay on.