Farkles on the RS

[Grumpy Goat]

Absolutely must haves or dos? No.
None I think would be universal. 

Ride it for a while. Your must haves will become apparent. 
...

I agree on the "no universal must-haves".

In all these years I have owned the bike, the only thing that is not tied to rider preference is the windscreen / wind flow. It is almost a universal criticism that the stock windshield is, how can I say, less than ideal. I agree that there can never be one solution for all body dimensions and proportions, but no one seems to have positive comments on the windflow from the stock windshield.

To me, that is the only "must-have" upgrade to this bike. Maybe the mudsling and cylinder head protection are both a close second. Others are based on individual taste.