I've got them, both bolt on for the audax bike (so no real alternative with their modified hub, apart from their steel version) and threaded for the commuter. Come in pretty colours and save about 10g in weight! Guestimate I've got at least 5000km out of them - swapped the original one out before the Transatlantic Way last year for prudence really, wasn't showing that much wear, that's still going, and I run a 16T pretty tight with 44/45/46T depending on terrain.