What's the difference between the Nero SL and Q50 models? Are these units superior to or compare to the Pronto 9400? I need a remote that will do 'all' that a remote should do. Programming should be fairly easy; although I'm OK with a learning curve. I seem to be leaning toward the NeroSL, but want to make sure it's for all the right reasons. I'm just not experienced enough yet to know if I'm covering all of the bases. Please advice. Thanks!