Been carrying this for at least 6 months now and it seems to be well made and designed. The driver bits are not very long, as others have mentioned, but it hasn't been much of an issue yet. I have not used the chain tool, I should try that out at home sometime on an old chain. I ride alone more than 90% of the time, so I have to be able to deal with whatever issues arise. This tool is a main component of my get back home insurance policy.