I’ve had one in my full suss bike since October last year and it’s still very smooth. I’ve also bought the grease tool for it, which I think is pretty much essential to justify the price; after all, there’s little point dropping £100 on a BB that has the ability to be properly regreased if you don’t have the tool to do it.
Thing is, it hardly seems to need any attention. I’ve done it once in the time I’ve had it installed and in all honesty it probably didn’t need doing then. They are very well sealed and so the grease that came out was more or less clean.
That was now about four months ago and the bearings are still smooth and clean and there’s no need to do anything to it.
That sort of contradcits the point about the special too being mandatory; I guess you just need to adjust your expectations for servicing intervals (much longer than for other units) and life expectancy. At this rate I can see it lasting a good three or four years.