The SIGs are better than the Vortex dollar for dollar, but they have a 5 year warranty whereas the Vortex is lifetime. I have used the V1800 and the Kilo2000 (What I own) and Kilo2400 plus a Bushnell 1 Mile and another one around here somewhere. Both of the Bushnell's went out about a year after the warranty expired. The Sig is 3 or 4 years old, I bought it right when they first hit the market and it has been fantastic. I have ranged PRS sized targets to a mile and big game to 1600 or so. The SIG does better on snow and in rain, which matters to me for hunting. When the Kilo2000 goes out, I will be getting the Kilo2200, or whatever is in that same range.

I am looking at getting Hunter (14) a Vortex primarily for the warranty, and he won't be shooting much, if at all, anything past say 700 unless I am with him anyway. But I want something that will last him for a long time, even if it is with warranty support.