buy a powrttouch , every one they sell makes me a bit of money ( i supply powrwheel with parts) and in this economy my little business needs all the help it can get.
I fitted an Ego to a friend van,it took about 3 hours and was very easy .The Ego unit woks very well with a soft start ( ie , the motor ramps up slowly) and is easy to use.The only down side seemed to be binding the transmitter to the reciever.
I dont know anything about the Rhyno apart that like the Powrtouch it is actually made in the UK from UK sourced parts... a rareity in these days of imports.