"After a few weeks of tinkering, this product is definitely earning it's keep. Most of my projects actually utilize both PF and 9V components, but even a strictly PF setup runs smoothly. It gets a bit clunky if you're running multiple wires in a narrow corridor (such as the 60051 High Speed Train) but it still conducts power without fail. I hardly see any reason to give this widely used product a low or average grade."