Nope, the only "problem" is, that the TVRemote-Controller Software sometimes "forgets" the codes that are on the hardware keys. Then you have to stop the software and start it again. This only happens once a week or so and starting and stopping take only seconds, so thats not really a problem.
The only codes that it cannot reproduce are the codes from the Pronto's internal library. Since memory is not the problem I learned the codes anyway. My ccf is about 500kB which is nothing compared to the 64MB the iPAQ has. I'm really fine with it.

Wilhelm