How is this compared to Apteligent/Crittercism?
We focus on giving you an extremely rich crash report and day-to-day workflow tools, whereas often other tools are more about high-level passive analytics. Additionally we work cross platform (web, mobile, and desktop), and go much deeper than most things that simply aggregate logs.
I would say the difference is our deep focus on mobile user experience vs Sentry's focus on cross platform error reporting. To understand your users this also means you need more data than just crash. For example: app load times, network data, UI latency, etc.