I have the Cortech Tri bags, and have a bit of bad news. I did a 700 mile trip this past weekend, which was about 50% aggressive mountain twisties, 25% 25-30 mph mountain traffic low rpm, and 25% 80 mph slabbing. Ambient temps high 70s to low 90s in N GA, NC, and Tenn.
Ending the first day I found some slight discoloration in the exhaust that coincided with the bag placement. We had ridden through some light rain, and on the right side neoprene shield, there was a thin line of grit running along, again where the bag would make contact with the stock exhaust heat shield. I cleaned both heat shield and neoprene carefully in the hotel that night with a damp towel.
At the end of the second day, while unpacking and inspecting my bike, there was a small chunk of neoprene stuck to the right side heat shield. I was able to clean that off, but not some light discoloration on both sides from the neoprene. Also, there was some light buffing of the right heat shield that probably resulted from the grit on day one.
One more thing, if you use these bags, you might want to remove the pillion pegs as the bags rub against these, which resulted in some tiny rub holes on the lower front inside corner of the bags. This was after moving the bags around and carefully adjusting the mounting straps. It seems like due to the angle of the seat and cowling, the bags want to shift that way.
I bought these after reading the good reviews on
http://sport-touring.net, but my experience was otherwise after two 8 hour days in the saddle.
On the other side, the bags are well made, look good, and my riding buddies tell me have good reflectivity as seen from the rear.
Hope your experience is different than mine.