Excerpt: Not waterproof, a significant drawback for a bino designed for field use. The rain cover for the eyepieces slips off easily and will not stay in place - easily lost. The 8.5 X 21 has a very small field of view, very difficult to find your subject, especially if it is moving. Consider the 6.5 X 21 with a larger field of view, even though final magnification is less. Close focus is very nice.
Pros: Close Focus, Compact, Lightweight
Cons: Difficult To Focus, Not Waterproof, Small field of view