I keep sets at work and home. I like my Knuckle Savers most of the time, but I keep the RP's as a backup set at work. My primary sets at home are RP's.
I've only ever broken two, and both were during questionable use. I broke a 3/4" while using it as a ghetto striking wrench, and I snapped a 15mm with a 2' pipe on it. I've got the older "Quick Wrenches" too, which qualify as a long pattern RP that are really handy.