It's really cheap and fun. I wish the zip line was longer, but very much worth it. The actual wait in line can be misleading. You wait in line to buy a ticket on the ground level, but once you take the elevator up to the platform there is another longer line to go on the zip line. Just a heads up if you are in a rush.
Keep your eyes closed so you won't be detained as a witness to the shady drug deals going on below. Remember this is Freemont Street.
Definitely a good time and will be back soon.