I was comparing it to the AGM TS-25, it’s a little cheaper and has a 50hz instead of 30 on the Sig, but I’m already invested quite a bit into the BDX line so I’m excited to try it.Posting to help OP since there aren't many reviews out there on the Echo 3. I have two of the 2-12 versions and they are fantastic. Super lightweight, no tracking issues thus far, holds zero like a champ. Resolution is fantastic. Can't speak highly enough of this thermal.