Las Vegas shows are designed to impress. As with everything in Las Vegas, it is all about the superlative degree: the most expensive production, the best performers, the most difficult acrobatic numbers, the most sophisticated lighting and staging. Did you know there are several aquatic shows in Las Vegas not available anywhere else? "O" and "Le Rêve" are sold out for every performance, so it makes sense to purchase tickets online in advance.
Make sure you visit at least one show during your trip to Las Vegas. It is a new kind of experience you cannot get anywhere else.
But the experience is more than just a show - most performances happen in a large hotel complex and it is a perfect way to spend an evening in Las Vegas: explore the hotel area - each of them has some unique features, learn more about these, and there are multiple restaurants and bars to choose from. And, of course, if you wish, you can always spend time at a casino.