It's great. Really it is.
Not only does Johnnie's give you a more "hometown feel" over other grocery markets - but it also sports some kickbutt deals. XL shrimps at the major grocery stores in the area are on sale for about $8/lbs this week. You can see the entire weekly ad ON THEIR WEBSITE.
There's other Johnnie's around the Boston Metro area - but if you aren't on the South Shore, then you're just wrong.