Joe,
The only time I have ever had a string to mess up was once when I was paying no attention and left to much length on the rewind. It wrapped around the shaft before the motor got up to speed enough for the cutter to cut the long end off. The other side was ok and I just messed up by not paying attention.
I may get the leaf blower attachment so I can blow the red dust out of my upper lot across the street while my neighbor is in Canada.
Ron