I like that it shows you what's going wrong with your app, so there are no surprises when something goes down - we've been able to pinpoint issues in our codebase much quicker than before! It can be difficult at times trying figure out how best use this tool but once things start working they really do help keep everything up-to date without any problems or downtime of my own making (yet!). We have used other tools such as Sentry previously which was great until one day all alerts stopped coming through after some time had passed since their last update/release etc., whereas lean sentry never misses anything important even if its just minor errors / warnings within our application itself rather then being caused by external factors outside of ourselves e.g.: database not responding due too high load; server crashing because someone changed permissions incorrectly etc..