Is that expensive now that you couldn't use a longer piece to get where you needed to go??
A second floor wall in a three story finished house was being removed. Several switch points coming from various locations were moved 5' over to the closest wall. It was one of those situations where extensive wall tearout would have been required to do the job right. I have read about these somewhere before and recall some fuss about their use in concealed walls. It would be very interesting to corner the UL people about these.
