I was riding dirt roads near Phoenix with a friend about two months ago. We'd already done 40 or 50 miles, he was leading on an '09, OEM rubber, with a 'Crampbuster' on his throttle, when he went into a right-hand turn a little 'hot', got onto the brakes which straightened up his bike, aiming him at the left side shoulder, soft and sandy. He hit the shoulder, managed to get off the brakes so his line became a curve, kind of following the road but on the shoulder, but NOT slowing at all. His V fishtailed a bit, looked like he had 'caught it', but STILL not slowing, and then straight at a rock (maybe 18" high) which he hit with the right side of his bike. He and the V went down, and I ran over to help. (He was OK - wind knocked out of him, but his V was leaking antifreeze from the water-pump area.)
While we were waiting for a tow-truck to pick up his bike, our discussion lead to the conclusion that, as he "panicked", the heel of his palm had kept pressure on the Crampbuster which was why he hadn't slowed till he hit the rock. He has since thrown it away into the desert.
The V went to the dealer where it looked like it would be repaired for around $3500.
He called a few days ago to be told that, as they were replacing the water-pump, they discovered that a "rod" that goes into the engine's interior had caused MORE damage to the engine, so now it looks like it will become a "write-off". He did NOT have any engine guards on his bike, and looking at the S-Ws I have on my '09 while remembering the crash, I BELIEVE that if he'd had them, they might have been what contacted the rock, saving his engine.
This friend is the SECOND friend to have a 'crash' that may have been caused by, or certainly helped to occur, by the presence of a Crampbuster.
Be careful out there!