Juice: Jewel or Junk?

In an attempt to be uber healthy in 2013, I've been going to Adventure Boot Camp, running, ellipticizing, and trying to eat the good ole 80/20 rule (supposedly followed by Selena Gomez and the like), and now I've stumbled upon juice cleanses (specifically Suja Cleanses).

Ever the fad chaser, I've fallen prey to an instagram from Jef Holm (of Emily's season [see yesterday's post] of the Bachelorette), in which he says he's done the 3-day cleanse and is going to try the 5-day cleanse. After reading the website, I'm sufficiently intrigued and want to try either a one or three-day cleanse in the near future (if and when I do I'll be sure to let you know the results).

I'm curious to see firsthand what all of the hype is about, but I'm tempted to think "good enough for Gwyneth and Kate Hudson; good enough for me." 

 Anyone ever tried it?