No longer a slave to "padded adult diapers" has been the single best upgrade I have made to my bike build. I wear whatever shorts I want and can ride all day in comfort. No friction, no sores, just sweet spinning all day long. The 1 and only thing I would change if I did it again would be to possibly swap for the b17 with the cutout in the middle. But still, more than pleased with this thing so far.
As far as break in, I guess my butt is a lucky shape because it was comfy right away, and 200 miles later its really starting to mold and just gets better every ride.