Tim,

Re your question: As you say, the Pro Producer 7 (URC 7070) has a bunch of empty keys down at the bottom, all available to be learned onto. However on that unit, you can learn ONLY onto those pre-designated blank keys. And they can't be included in macro sequences either.

On the other hand, while the Cinema 7 has fewer pre-designated learning buttons, you can learn onto any of the other keys as well. Plus learned functions can be used in the same way as any other key in macros.

So bottom line, if you just need to learn a bunch of functions onto fixed keys and have no need to use them in macros, the 7070 is adequate. However, if you want maximun fexibility to custonmize your remote, the Cinema 7 is the way to go, even though it has fewer total keys.