I just had one put in Elvis since the dealer had the primary apart anyway. Only have 200 miles on it, but I like they way it feels especially on decel. The standard shoe when properly adjusted always gave me something of a whistle on decel that I notice is gone. Also, from the feel of my boot against the primary case, there is less vibration.
I've said this before - - - -when the MoCo follows the aftermarket with a part it is usually because that part is a good idea AND the MoCo usually improves on it. I was never interested in these until the MoCo offered one. I will post if I have any problems with it.