Both are completely different from each other. For one, the connecting link is a bit different for the D101 than it is for the K710SL, in fact the D101 comes with a little packet of white lithium grease to use on the connecting link before installation. That doesn't come with K710SL. Can't go wrong either way, but I would probably say the extra $10 is worth the difference. Have used a K710SL and am currently on a D101.
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Appreciate the old bikes more than the new.