Drivers in staging folder

Hi All, I've had a look at the TODO files but I'm having some difficulty with finding out which devices each of the drivers support. My plan was to find a driver in staging, get a device off ebay which uses the driver and then start working on the TODO. Is this the right approach and is the actual device (for testing) needed in order to do cleanups in TODO files? Any help would be really appriciated. Thanks, James