Bertha's and Bo Brooks

I'm going down to Baltimore and I'm curious about Bertha's. I've seen the bumper sticker everywhere and I've never actually eaten there (I go to Baltimore frequently). Is is worth a stop? Are the mussels any good? How about their afternoon tea?
I went to Bo Brooks for crabs and they were enormous, sweet, meaty and tender. They also have very large, deep-fried onion rings that are somewhat over-breaded but greasy and finger-lickin' good.