I just bought the 1535nm from Steiner. I compared it with the M830r 905nm the Swarovski and the Leica. The big advantage of the Steiner was the Porro System. Once you focused it, you always have a sharp picuture. Additionally you have a built-in MIL-reticle, which is a big benefit for me as a long range shooter. The Steiner also has a scan mode, once you push the button for 3 sec it automatilly measures, wherever you look. Glasses had been on all models up to the highest level. A friend is in the Airforce and they are using them too and had been very satisfied. I do have a Leica Geovid too. Never had any problem with it. So definately also a good choice.