Finally saw this, easily as good as everybody had been saying. Agree with Jayme, the ending is just totally satisfying from an artistic point of view, the perfect way to end the movie.
As for the complexity, I think the overall narrative made an extremely large amount of sense (let's compare with, say, eXistenZ, where you have no clue what is happening), but there were aspects that were left somewhat vague in the details. Primarily why is Saito an extemely old man after his time in Limbo, whereas Cobb, who went to Limbo before Saito died, is still relatively young? Also the nature and timing of the synchronized "kicks" was a little off at times I thought.
