In another thread it is mentioned how long their gruppos lasted. This had me surprised and wondering. My Ultegra set has done 10 000 km and the chain needs to be replaced. I am planning to replace the cassette with it, although I can't see any real wear. Both chainrings seem good. I'm leaving them on. I've also just replaced both brake pads. What mileage are you getting from your gear? Please, no BS. Be fair dinkum!