FoF is an extended, much, much more lavish version of the original LotD (filmed 2 years earlier).  With 3-4 times the number of dancers, even more elaborate stage settings than LotD, almost every single dance from the original, plus a good number of new surprises (not to mention a higher video quality), FoF is a truly, amazingly grand spectacle.  One also can't help but marvel at Flatley's extraordinary talent - not just in dancing, but in production, directing, designs, the flute, everything.  When will we ever see such talent again?