I was in the market for a new LR rangefinder as well. Did a ton of research on the new 4k Vortex, Leica 2800.com, and Leupold rx-2800.
Owned Leica 1600 and it was great, but wanted more power and the Leica was rendered useless in any sort if precipitation (rain, snow, sleet, etc.)
Owned a Sig 2200MR, it was a total pile of junk. 1368 yards was the best I ever got while hitting a very large reflective target (steel buulding). Customer service blew me off and basically told me "too bad, that's good enough". Wouldnt even allow me to send it in for inspection. I will NEVER buy another Sig product again after experiencing their horrible customer service.
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Currently own a Nikon Black 4K. Very powerful and reliable, but the glass is a little lacking with non-HD lenses and only 6x magnification. This is the rangefinder I gave to my son, so I still needed one.
After endless hours of review, I finally settled on the Leupold rx-2800. Has nice HD 7x glass, different reticle modes, ranges well beyond its stated rating even in normal daylight, and has an internal Ballistics calculator. The Leica 2800 also has all those features, but I don't need bluetooth and couldnt justify spending over double the money with the only gain being bluetooth functionality.
You cant find a bad review on the Leupold rx-2800 anywhere and it was the best performer at long range in all conditions when compared by others to different rangefinders. Its sitting at my house right now waiting for me to get home and review it. Excited to see if it lives up to the hype.
Heres a great and very thorough video review by "Rex Reviews" on YouTube. He really puts the RX-2800 through the paces. Extremely impressive performance in broad daylight. He even tests it in a heavy snow storm where it still return ranges up to 400 yards. My old Leica was great, but as stated before, it was completely useless in snow and rain. So that's another plus for the Leupold.