Just got my 17-85mm lens back from Canon which had a bent barrel from a few weeks back. Here's 2 comparison shots of what photos looked like before and after, nothing special, just my backyard taken at 17mm infinity focus so I could see what was happening. Just need to clean my sensor again now as some annoying dust bunnies have decided to setup camp
With bent barrel, this whole shot is blurry and far more so on the left side
Fixed taken not long ago, happy with the results (they cleaned the inside of the lens which had a bit of dust in there to) and only cost $65 to fix which I was expecting a fair bit more.