Get it! Riding without it was okay. Then I rode with it. I'd hate to go back to riding without it.
The TRE makes the bike think all gears are 5th gear:
5-5-5-5-5-5-5
The Smart TRE makes the bike think all gears are 5th except for Neutral:
5-N-5-5-5-5-5
The GPS mod make sthe bike think 6th Gear is 5th:
1-N-2-3-4-5-5
They all remove the top speed restriction since only 6th gear is limited to 10,5000rpm (the rest top out at 11,500) but only the TREs remove the retardation in the lower gears.