Originally Posted by
Hermes
I had OSPW envy until I purchased my 12 speed SRAM red equipped Specialized SL-8. And the shifting is flawless after 4500 miles. My advice is make sure the OSPW mod does not impact the shifting and go from flawless shifting to yeah it works most of the time.

Agreed. Mine is Ultegra 12-speed Di2, and the shifting is pretty sweet.