The quickshifter was the best upgrade I did. Now when I ride my other bikes I feel spoiled with the EBR. Riding the bike is much more enjoyable without rev matching up shifts and clutching for smooth shifts. If it was 500 bucks with what I know I would spend the money on one again.
With the ecm you must acquire the quickshifter for full use of this bike and the smile will pay for it lol