Thank you for asking, Total Artist. 
But, no, I have not.
It’s just a little pricey for me, and I take good care of the bearings I have - both flat and “u grooved”. And I personally don’t agree with equipment over skill. The claim that “this bearing will sleep a yoyo for over 3.5 minutes when simply rolled off your hand” is pretty bold. But, I consider myself an average Joe thrower whose skill (or lack thereof) doesn’t really require such long spin times. I do about 4 or 5 tricks before I choose to bind. That’s only about 30 seconds. A simple steel bearing is all I need to have fun. ;D