Broke my chain the other day and had no means of repair, so it was quite a nuisance. Point being that it was the powerlink itself that broke (and yes I did have a spare at home but not with me, and yes I could have mended the chain without even a tool, and yes they do only weigh two grammes, I did reflect on all that). But I thought it was Shimano chains that were most likely to break and I hadn't heard that it was the powerlink itself that was the most dodgy bit of a Sachs/SRAM chain. Do powerlinks break all the time and I've just been lucky (or feeble) up to now?