I spoke with the head designer of the new Destroyer bow at the ATA show last week. I asked about the scrape marks inside the limbs being reported on some bows and he told me that they were probably caused when changing the draw length. The bow is designed to have really tight tolerances in that area but when relaxed in a press to rotate the draw module they may touch when over-rotated. If they were truly touching on the shot, they would gladly fix it for you but that it has not been a problem. I've been shooting a Destroyer 350 since last November and really like it. Pulls like a bow that is 20 fps slower (without the huge hump in the draw cycle) I have a 340 on order for myself so I can have one of each. Almost everyone who has shot one has bought one so be prepared before you check one out. I have several in stock for anyone interested in looking at one. I will also be donating a brand new bowtech of choice to the Iowa Bowhunters Association to use for a raffle at the Spring Banquet and Deer Classic, so you might even be able to win one! As far as testing the 340 vs 350, haven't done any extensive testing but most people are having a hard time telling the difference and making their decision based on the specs, giving the 340 the edge with the full 7" brace height.