I've got 6 RHP's from Pro Products(PP) and they are controlled by Herpstats. I've spoken with Bob several times and he is very easy to do business with and it's a flawless transfer from him to Animal Plastics for the clean installation I like.
I have no experience with RBI panels but only know what I've read...both good and bad to be honest....so I will not speak to their reliability or lack thereof.
I will, however, say I've never had a problem with my panels or the customer service I receive from PP. I can also appreciate the fact that they are used in zoo's. If a zoo deems them reliable and accurate enough to provide for their animals, they're good for mine.