Great experience. I have to say it is worth the $$ although I have to say this was a gift so didn't have to spend on this.
Drawbacks: you have to take about a 40 minute ride from the Strip to Boulder City where the helicopters are but I think it is worth the trip. They give you a champagne lunch and just being in the canyon via a helicopter does not compare to anything. I hate to say it but you'll need to experience it for yourself.