Hello CalStyl, I rented a slightly used 9650STS for 200 hours last year to help get "caught-up" with our custom work. I had no problem getting a clean sample from any of our crops, with the exception of trefoil seed which yields a perpetually dirty sample regardless. My problem with the STS is (you guessed it) the high wear and extreme maintenance costs on this machine; - I don't think the STS is the answer. I'm not "knocking" the lexion itself, I'm happy with the combine when there's a support infrastructure behind it; - I'm just "blessed" with a very poor dealer who treats "ag" equipment as a sideline. If I had my choice of rotaries, it would either be a Gleaner or CaseIH 2300 series. If our local CAT dealership is assigned to a better company, I will definitely consider a CAT again.