I've been running a large ember app since the pre-1.0 days (2013). We made a few bad choices early on in how we structured our data models that were not the "em

I've been running a large ember app since the pre-1.0 days (2013). We made a few bad choices early on in how we structured our data models that were not the "ember way" and took a while to sort out, but overall it has been smooth sailing. The 1.13 -> 2.0 upgrade wasn't too bad, and the 2.x updates have been painless. At this point they're pretty good about issuing deprecations a version before they make breaking changes, so upgrading just involves bumping the version and fixing any deprecations that come up, to prepare you for the next version. They have been pretty aggressive about ensuring addons work with the latest version; you may have issues with newer addons if you're stuck on a very old ember for some reason. `ember-try` is great for running CI against all ember versions.