I got a BOLT and really liked it. Then I checked out a RM4 and I really liked it. The difference is the kwa has almost the same amount of kick no matter what your cycling speed is but it also mainly kicks forwards. The bolt kicks backwards but can be slower or faster based on your cycle speed. There are more features on the kwa that are nice but I'm still happy with my bolt. The main reason I got the bolt was for rear wiring. Now that kwa has that I'd probably go kwa over bolt if I had to buy again, but I won't be getting rid of my bolt for a kwa.
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