I'll be blunt:

The Binding Coil of Bahamut represents everything wrong with endgame in MMOs today: Crappy monster designs, crappy spell effects, and a crap ton of mechanics to "make up" for it.

So will Crystal Tower be more like Titan and The Praetorium (Fancy moves, Michael Bay Explosions, glittery spell effects oozing out of your screen, Michael Bay Explosions, cool boss designs, and did I mention Michael Bay Explosions?) or will it be more like The Binding Coil of Bahamut?