Century 16 is one of the nicer theaters in Vegas. It has plenty of showtimes to choose from and plenty of theaters. The seating is tiered, so that if you get someone taller in front of you, you can still see. The seats are nice and comfy and do recline a bit.
The XD experience is nice, if you can afford it. Seats seem to be a bit wider and the screen is floor to ceiling and wall to wall. Definitely THE way to watch a movie. It is pricey at around $15 per ticket.
Overall, a nice theater to watch a movie.