I've used the same device at the same length on and off for many years. It was the fast size device - and it is still holding up even though it's been off the market for some time.
The last few times I've used it - I had burning pain with urination, and some mild residual pain. I limited my use to 2 hours - since I hadn't been using it often. What do you think?
I also think peyronies makes the penis more sensitive...but I never had this happen before.