How SteamVR games can run on Oculus Touch and Rift

Last week, UploadVR let you know about 10 great SteamVR games that work well with the Rift and Touch by default. Now that the Touch controllers have officially released into the world, we decided to tackle the topic in a bit more detail. How well do the Oculus Touch controllers work with SteamVR apps that are only designed with Vive in mind? Is anything unplayable? What are the common hiccups and limitations? Is it even worth buying things that may or may not get official support?
First of all,