IDK, but considering the reading I've done on them since their release, Time I've spent on the forums, etc.... I'd imagine the percentage is pretty high.What do you think the average number of returning Rdbs to Kt for qc issues is? There's like 20k of them.
And it's not just RDBs...
Both my KT tools have been back to the factory for serious issues.. My sub 2k went back twice..
My RDB light striking seemed to be a pretty common issue that required replacement parts and internal work.