Oh this place is just the best. I'm a Midwesterner, and confess that until I moved to the east coast, I'd never heard of the exotic lobster roll!!! I'm obsessed with it now, so have eaten rolls all over New England (Maine included), and this is the absolute best one, no contest. It's hot (not like a cold lobster salad roll, which is delicious in its own, separate way), it's covered in butter -- it's dreamy. The best thing to do, in my opinion, is go to Neptune Oyster for lunch or an early dinner (3-4PM has been a good time in my experience, even on a weekend), an hour or so before you're really ready to eat. Put your name in, and wander around the North End until they call you. I've only ever been seated in the bar, but that's just fine. There's a nice window view there. You'll have to tolerate all the poor souls that come through the door and leave with disappointment after being told how long the wait is; they always cast a longing look at your plate!!
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