As for myself, I would rather have speedometer accuracy over odometer accuracy. However, everyone must make his own decision regarding this matter.
Of course, one could set the Jaycar Speedo Corrector somewhere in the middle, and he would have a 5 percent 'optimistic' speedometer, and a perfectly accurate odometer.
Of course, I am assuming my measurements are correct. I heartily encourage others to complete the same experiments, and report their results.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894