What's the downside?
It has this knob that allows you to adjust it. I just started reading about it and it allows you to adjust "sag". But don't most bike has this feature.
First of all, congrats for picking up the Veefer 800
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"downside?" Bottoming out (depending on load weight) and harsher ride.
The "knob" looks like some kind of compression damping adjuster. It effects traction and bottoming out resistance. Increase the compression damping, traction improves, and decrease it, less traction. Read more about it and adjust it to meet your weight, riding environment, and riding style.
And yes, most modern sportbikes comes with it stock.