We run a 9650sts and cih2188 side by side for all of our harvest. They're both good machines and when the going gets tuff, the 9650 has the edge. The only dislike we have is the sts is very expensive to maintain compairing to the 2188. Also, while doing maintainence, the sts is more of a pita to work on than the cih2188. Basically they're comparable in everything else.