I've got a Pyramid 30 Amp. It's a bit bigger than the Rivergate, but solid as a rock. It's about 8 years old now, it has never given me a problem.
I've also converted a mini-ATX PS to use with my charger. Very small, quiet and good for 4 Amps @ 12V and 15 Amps @ 5V, great for Micro racing