Many people have commented that the full lobster entree is a 1 1/2-lb Maine lobster whereas the surf from the surf and turf is a rock lobster or some lesser quality tail. I have every reason to believe this. You can also be sure that most products you are being served, particularly the seafood, have been frozen (with the exception of the farm-raised product they get from Epcot). Are you under the impression the Maine lobsters are kept alive in a tank while flown from their waters of origin? They are frozen too.
You can substitute the lobster tail with scallops. Many have done this and say it is just as good. However, you probably won't feel like you're getting $58 worth if you do. We have ADRs at Narcoossee's but I think I'll walk up to Citricos right before and see if they have availability. If so, we'll dine there. Citricos is such an underrated gem -- it puts Narcoossee's to shame.