The kahles msr2 has the better reticle, warranty, price and does not tunnel like the SnB. I really like my 624i. The paralex adjustment can take some getting used to and was a little stiff new, but those are the only negatives I can come up with. As far as reliability you hear about a lot more SnB failures, but comparatively there are alot more in use. The 624i eyebox is very good and among the best in the field, its a pleasure to get behind. My eye never seems to get tired as it did with lesser optics. I also prefer the location of the illumination control on the 624i.