I have always liked the Tekonsha products. I still use a 10 year old brake control, never a problem. It is a Voyager model, basicly the same as the one offered today. It has been in 4 trucks now, and has towed from 1000 # singles to 15K # triples without a problem. Our shop installed several Tekonshas daily, and never an issue. I think we had one bad one, and I'm still not convinced the mechanic had it installed correctly.
I've not used the Prodigy, but the specs look good, and I would not hesitate to try one.
The "maxbrake" looks interesting, but I'd be reluctant to tap into my brake lines when I'm satisfied with products that don't require it. my 2c ...
You probably know this, but when it comes time to install the BC, be sure to run the + and - exactly as the instructions say (probably to the battery). A loose ground (for example) makes for some "unpredictable" results.:smilies27 Proper wire guage is also important.