app-route is still in beta, so we'll probably want to wait a bit before deciding to use it. It also uses 2-way data binding to broadcast the URL of the page as well (like iron-location), which, if we do eventually switch to something like redux (and possibly after the Polymer 3 transition...) would be a problem. 

Looked at PolyGerrit, and it looks like they use their own custom-implemented router to deal with this. 

Looking more into app-route, it doesn't seem to really provide all that much besides url parsing. 

We could probably get away with refactoring our routes into a more standard system. PolyGerrit basically has a file with a huge bunch of regexes and a lot of other things. Not the prettiest, but I think it beats having random url parsing logic spread between components.