My two's purrs are completely opposite to their purrsonalities!

Mitzi's is very loud, rumbling and sometimes she gets the hiccups and snorts when she is having a "purr-gasm."

My Maine Coon Giant Mishi has a very quiet, gentle purr. You have to put your ear to him to hear it. He doesn't even "vibrate" too much when he purrs. Ah what a guy!