Pat,   After 50 rounds I can honestly say I love what Sig has done.  It is very accurate and for a big "heavy" pistol very enjoyable to shoot.  Plan on shooting it with my 2 sons this afternoon, weather permitting.  
I bought a P320 Compact .45 acp last year to replace my 1911.  I became a big fan of the P320. So when I heard that SIG was coming out with a new 10mm, I knew I needed that as well.  I do not think it is a big seller though,
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Eric