I've had all of the big three in RF and will share my experience...I have nothing to gain here, so I think I can speak impartially.
I started with the Leica geovid (non-hd) 10X42 and used the hell outta them. Great glass. Reliable, reasonably priced (with some looking), and quality optics.
I then bought a pair of Zeiss RF 10X45s from Doug at Cameraland Demos (honestly, I think they were spankin' new) and they were fabulous. A bit larger than the Leicas, but quicker readings and slightly better ranging capability. Stunning glass, but not quite Zeiss 'FL' bino quality (probably due to the reflective coating to protect the user? (laser)).
They were bombproof with the rubber armoring and felt the best in the hands. Ergonomically numero uno.
I got the Swaro bug and traded the Zeiss for the Swarovski EL Range in 8.5X42.
The Swaros were like new, and were very nice. The optics were stunning for RFs! I didn't like the seperate readouts in each eye, I'd rather have all readouts in one eye. The Swaros were the least reliable with readings and they never felt perfect in my hands. They also quickly suffered from the worn paint on the hinges--not a huge deal, but unacceptable for top-buck alpha glass. The Swaro are spendy! One had better be getting a great deal to justy the purchase, imho.
I went back to the Zeiss 10X45 RFs and they will be my last for awhile. I nailed a steal of a deal from a guy with a mint as-new-in-box pair. All things considered, they are simply the best I've used.
In fairness, I haven't tried the old school HD Geovids or the newest HD-B Leicas. At $3000 Leica recently lost me as an RF buyer, that kind of money is outrageous. I bought two Toyotas for my teenage kids with the kind of money.
Also, with no angle compensation under 100 yards, Leica screwed the pooch. I am a bowhunter and expect $3K glass to have that function.
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