I am jealous. I have been drooling over the Sig. A few years ago a fellow deputy sold his Delta 10mm with dies and six mags for $500. I was broke at the time, but it still makes me sick. I could dump bowling pins every shot at 50 yards with that thing if I didn't get carless with trigger control.
Mine was a little more than $500 but shoots just like you describe. So far I only have 100 rounds through it but I AM looking forward to shooting it a lot more in the near future.