It's great, and it still works flawlessly. I usually just leave the switch in the on position and forget that it's there.
The electric motor + battery is only 70% efficient round trip, so you want to be careful not to use assist unless it's necessary. Without the mod, assist kicks in whenever I accelerate or climb a hill, then regen drags down the fuel economy to charge the battery back up. With the mod, I'm free to move the throttle through its full range without much impact on the fuel economy, and hills don't hurt my fuel economy.
Btw, I'm warming up to the side view camera, too.
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