Judging from what I've read on another thread, I must have had unusually good luck in getting a lobster roll at Neptune Oyster recently. Here's a report -- it's for the hot version:
Roll: a high quality brioche hot dog style roll, top split, toasted, slightly shorter than a standard hot dog roll.
Filling: all lobster with a buttery coating, tail and claw meat, pretty much all chunks. Has a nice rich flavor, hint of briny ocean from meat, very subtle sweetness from the butter, likely fresh picked meat. Portion is generous.
Price: mid-range heading to expensive, but well worth it at $22 plus tax.
Bonus: comes with a large portion of skin-on hand-cut fries, excellently cooked, crisp outside and not greasy, with definite potato flavor.
Service was friendly, prompt, and efficient.
For many, this is probably their ideal version of this sandwich. I'm inclined to agree, as it's the best I've had yet.