We were confused about the options available: views, dinner, expensive, free¿? Now that we have been there, know that there are several options:
Top of the world restaurant (floor 106)
-Dinner at the rotating tables: 45-70$ with an entry free 25$ extra.
-Dinner at the fixed table/bar: idem with entry free of 15$/0$.
Sky pot - Observation desk: 15$ entrance.It is the cheapest, since it just going to the last floor for the views (floor nº 108). You can also buy there some snacks (108 eats) or cocktails (108 drinks). Not dressing policy I would say.
At the observation desk you can also buy tickets for the 3 attractions (floor 109).
The stratosphere has nice views from the strip, but just one of the sides (it is on the north end of the strip, nothing to look at apart). Take the car (is far and parking is free). We found nice the helicopter flying north and south of the strip.