I only have about 2 hours on my 12' 690 Enduro R since the arm installation but its probably enough to comment on performance of the arm excluding a durability rating. I bought it to help solve the common 5 gear false neutral and improve overall shifting quality shifting. I can say it has made a huge difference there, I had no false neutrals during the ride. It provides a smoother shifting action both up and down with a more precision feel. C bost is a bummer and it seems overpriced to me. If it didn't work as hoped I would have returned it. I'm keeping it.
My Specific Ratings 1-5..
Quality = 4.5
Ease of installation=3
Installation was easy laying the bike on its side, then removing the foot peg support and brake pedal out of the way. The 690 foot peg mount bolts through the swingarm with a bolt on each side so no pivot shaft to remove not a big job, the swingarm stays in place. Next Iremoved the clutch cover taking note of the bolt length in its location. I'd recommend buying a new cover gasket ahead of time. The shift arm has a 8mm bolt holding it on, remove that then the arm and spring with bushing. Transfer the bushing to the new arm and spring then assemble the new arm in place using Loctite 243 on the bolt threads, lineup the shift detent with the bearing end and the bolt with the shaft and arm and torque it down. Take your time here.
Install a new gasket and bolts in the clutch cover and the peg and brake lever. Go Ride!