Well, I opened mine last night.
The Sarlacc pit comes in three pieces.
The first piece is the maw of the creature. The "beak" from the Special Edition does come out, so if you are so inclined to not display it with the "beak", you're in luck. The "mouth" is made of a rubbery plastic and the tentacles are "bendy" (soft plastic around a wire frame)
The next piece is a hard-plastic mound. The mound is sand colored and basically goes around the entire "mouth" piece. At this point, the Sarlacc is doing pretty good. You could theoretically display it like this if you wanted, in fact, in 20-30 years, these two pieces will probably be all that remain.
The final piece is the big rectangle of sand and it's made of (surprise!) the same cheap flimsy plastic that was the base of the Lars Homestead. In fact, I'd almost go as far as to say that it's even flimsier than the Lars Homestead base. So yeah, Hasbro really cheaped out on this last piece.
The Skiff is the Skiff and the figures, with the exception of the Han and the Lando, all stink. So if you're buying it for the Sarlacc, just be aware that 1/3 of the thing is cheap plastic.