The one sig I have ever had (not a Tango, it was the Whisky 5) I sent back and was so happy that I wasn't hung out to dry on that scope. I wouldn't touch another Sig if you paid me.
I have had 2 SHV's, the 3-10 and the 4-14 F1....I would take those all day, every day over a Sig.
Dont turn your nose up at the leupold vx3i LRP. It's a great scope, tracks perfect, and the glass isnt too shabby. I have one that sits on my lapua. I also have a SHV and I prefer the leupold.