I like that it can be used to monitor any website or app as well, so you don't have just one solution for monitoring your apps/website! We also love how easy they make setting up alerts around things we care about (like web traffic).
Nothing really at this time but would say more features is great since its free right now with limited functionality though if needed their team will help out in getting what ever feature set might need from them implemented into our dashboard easily!! Monitoring my site & applications which was very helpful when looking after customers who had issues while using said sites /apps etc - being able get notified straight away of anything going wrong without having too many other tools open made life easier than before where i could not always know immediately something went awry.