Does anyone have any experience with this particular model? A friend bought one in 2010 and is looking to sell it. He's asking $520 for it. It comes with 3 mags, night sights, Short Reset Trigger and I believe a "Nitron" coating - whatever that means. Does this sound like a reasonable price? Is this model up to par with the original? Sigs have just never felt good in my hands but for some reason the E2 seems to fit better than anything else (for me) including my 1911s. All opinions are appreciated.