It's great to have one place where you can see everything about each server across different environments (dev/test /stage & production).
We've been using Stackem for quite some time now but I feel like there has not be any major updates recently so it may become outdated pretty quickly in future releases or something else will come up which we haven't thought off yet. However still good enough as long nothing comes out next year! Automate deployments between multiple enviroments with ease since SSM allows us do exactly what stackem does - visualize our servers through dashboards easily from cloud-based UI instead having ssh sessions everywhere just cause i need them ;-).