I have used my Sig Kilo standing next to my buddy using his Terapin. I was able to go target to target with him out to over 2K. Not saying the Sig is necessarily "better", it's just that I haven't seen where the price difference is worth it to ME. I normally shoot out to 1K. For that, the Sig has been spot on, and very fast. I really like it, and for the money, it's an amazing RF.. I've had the Leica 800, and the Vortex 1000. The Sig is heads and shoulders above both of those. For shooting out to about 1509, I don't believe you can go wrong.
I admit, I may be biased, as I do own one, but I wasn't biased when I was looking, and this is the one I chose.