I use 7100 and change oil and filter at 5000km intervals. By the time I change the gearbox still shifts quite smoothly. My mate has an RC8R that I do most of the servicing on and he uses 300v. By the time we do his oil you really can feel the difference in the shifts with the new oil. I know it's not a direct comparison, apples and oranges, but I feel the 7100 has better longevity for street applications. Nothing scientific but that's my feeling.
-Woolich/Race Tools/Log Box V3|-Graves Titanium/Carbon cat eliminator|-Ohlins Mechatronic|+2 rear|Stone chips & bugs