I've been up the real Eiffel Tower and this ride is a little disappointing compared to that. Of course my bar is naturally set high because I've experienced the real Paris.
This ride affords a great view of Las Vegas, so if that's what you want to pay for and see, you certainly get that. The lines are pretty long so I'm not sure if it's entirely worth it, but it's certainly something to do, even if just once.
It's just not an authentic Parisian experience, so don't go into it thinking that.