Son's bike had an issue with the chain slipping and seemed to be down to the odd link being kinked. Put this on and it solved the issue.
The chain did need a couple of links taking out, but was easy enough fit. For a top tip, if you're doing this yourself, get a half-decent link splitter. Overall, a good value chain, especially when the local cycle shop wanted £12 for a chain and £12 to fit.