Go early! I went here on both trips I took because of the barbecue chicken sandwich, the best I have ever had, and both times it was very crowded at dinner time. You can put your name on the list and do some walking, but if you just get there about 10 minutes before dinner time (5ish) you will miss the line.
This is a large Hard Rock, and has great seating on the second floor by the windows along a canal.