Vanilla is an alright shock but has no rebound damping adjustment (chelboed's Van. R does). This would not be an issue if the factory setting exactly matched that bike for your exact weight, preference and riding style.
If you can upgrade to an 'R' (Float or coil) it would be a good move; but not the end of the world if you cannot right away.
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Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."