I dunno. I've been through a thunderstorm in a Seneca without a problem. Come to think of it I've managed thick (circa 2 inch on unprotected surfaces) ice as well, also approaches to minima and an engine all but failed. Doesn't get much worse than that lot.
Don't get me wrong, I like flying the Navajo, and now only fly Pipers training other pilots, but the PA-34 still has a role in the charter market. Unlike Unique Air.
Try an EFATO in a PA-32 with 3 pax on board. That is how you have to think of a PA-34 at some stages of flight, but if you do it's perfectly safe.
P.S. Phil - did you know that Wikipedia uses one of your aircraft as the main photo in its Seneca article?