Without a doubt, one of the best cheap thrills around!! Had a friend from Australia in town and that gave us the perfect excuse to do something very touristy.
We went on a Thursday night around 10pm and it took about an hour from the line downstairs to actually ziplining. But watching the people in front of us ride down the cable was enough entertainment to pass the time.
I'm not that afraid of heights but my blood was pumping as soon as we stood on the "really stable" looking scaffolding. The most exciting part for me were those few seconds before actually ziplining and looking at how long the cable goes and the people on Fremont. The anticipation! The ride itself went pretty quick but it was a blast. Hooting and hollering with both hands in the air makes it fun and funnier.
I would strongly recommend this for any tourist visiting Fremont.