Great product and includes id technology - Nikon Prostaff 3i 6x21 Laser Rangefinder

I debated for a while between the 3i and the Arrow ID for use while bow hunting. The one significant difference I feel is that the arrow ID claims to be waterproof while the 3i is rain resistant. That being said I feel both units are nearly identical. The optics are very clear and very easy to find your target in. I also plan on using this for golf and don't see why it wouldn't perform just as well. I also purchased the Nikon retractable tether and it seems to be of good construction. It is plastic, but the retracting spring is very strong, holding the rangefinder in place until ready for use. My simple solution for waterproofness was a small pelican case similar in size. The rangefinder itself is very small and fits into a pocket and your hand easily. If you're debating between a unit that has ID technology, I'd recommend this unit. I also measures the unit against known distances and it appears to be very accurate.