I bought the whole fender/fin system for my XR and loved the convertible fender, but didn’t love the fins- they just weren’t for me. When I bought the fender and shield for the GT, I decided to try a mini-fin since it was pretty small and out of the way. It’s perfect- small and out of the way, but it’s great when you need to get up a curb. Absolutely worth it.
Having never used flight fins before, these lil ones are enough to get me up and over avg sized curbs. These add a new function to the onewheel that's pretty basic yet necessary.