jsc - The real power (RP-2) psu's are definitely a newer series. I just couldn't find out if there were any improvements. It's usually the high wattage psu's that get reviewed.
rand_79 - I always look for technical reviews at web sites like jonnyguru.com, xbitlabs.com, hardwarecanucks.com, and anandtech.com. Couldn't find any. Google didn't help either. I don't bother with customer reviews at vendor web sites.