I had the SE 6 installed on my scoot about 9 weeks ago. I have now accumulated over 3,000 miles on it, and it (appears) to be flawless. My dealer NEVER told me about getting the fluid changed @ 500 miles. It was my friend CVO Joe who informed me (thank God for him, this site and all who reside here) so I didn't just go on assuming all was fine. If any pieces, parts, or metal chips were found, no one at the dealer told me about that. I suspect that they wouldn't do it anyway, but one never knows if one can really find an honest H-D dealer. I absolutely love it. I did this to lower the RPM's, like everyone else did, for those highway speeds (I ride a lot of long distance miles) and the fact that this smaller drop in RPM (500+/-) was worth this additional cost for my m/c. I agree that it isn't much help in riding those twistys that abound where I live. It does help, on a daily basis, when I choose to take the speed up, and over 60 mph. I am constantly "forgetting" that I have a 6th gear. Took some getting used to. Nice effect is when you are next to another HD and you are accelerating together, and you hear each other shift at almost the exact time/RPM. Well the fun begins when he hears you kick in the 6th. Looks will describe his amazement as the noise level drops, and the bike edges foreword... WTF? I still believe that this was the right decision. I can see how easily a dealer could "forget" to modify the case, thus leaving the extra metal to do its' damage. I suppose that I wouldn't care about which tranny I used (no HD loyality here), but that lower 6th was what got me.
Just my 1-1/2 cents worth.
NH