I compare them as being basically the same. I run the Tango 4 6x24 on my 223 and my 6.5 bolt guns. I have the gen 1 Tango 6 on my grendel and it is great as well. Once Sig started using the Dev-L reticle it loses nothing to the PST
I have vortex viper pst in 2.5-10x44 and in 6-24x50. Have been curious about the tango as well. Does Sig actually make these or is it just their name on it? I'm excited about this forum!