Sorry I miss read your statement
I have been trying to decide whether to go IR or RF
I thought you meant two types of Pronto Pros.
I have not used the RF portion of a pro (but I guess that will not stop me from giving my opinion :-))
If your choice is between an RF extender or the Pro's extender, then I would go with the Pro's (or at the very least use half of the radio shack pyramids). with an RF extender you will need to point the remote to the IR receiver, so there can be interference with the macros (someone standing between them...) but with the Pro in RF mode there is no chance of that.