As a developer of a popular iPhone app there are many issues and bugs that I'm unable to reproduce. Therefore we incorporate very thorough logging, but up until Shipbook it was only available when a technical user would send us an email with the relevant information on his device where the information was logged. With shipbook we have access to all that information from a convenient dashboard. We can also cross reference the issue with other occurrences for different users and narrow down the causes for the bugs.
At Bazaart we value customer experience above all. By being proactive and detecting issues with the help of Shipbook before they are being reported we are able to constantly improve our product and keep our users happy.