I'm still on MI9, and I used the original Root De La Vega technique to do so. However, I'd like to know what's "under the hood" with Kingo before Verizon releases a kitkat update... in hopes that kingo's reputation will be cleared and also that kingo will be able to keep root on my phone when I update to kit kat. (Both tall orders, I know)
If I can throw in my two cents of paranoia... I realize that thousands of users have "used kingo and have not realized any issues" so my concern is not for popups or adware or anything that a user would realize. Besides, wiping the phone and installing a fresh ROM would probably fix that. Root access is a two-way street. Perhaps there's a possibility that part of my bandwidth or CPU power is being sapped (through an app or skimmed info I mention later) for some kind of crowd-computing bot network with nefarious intentions. That's concerning, too. But, data and battery impact would be evident.
<tin foil hat>
But... perhaps, during that initial kingo run, the combination of ESN, IMEI, and SIM card info unique to your specific phone is stored and archived somewhere; enough to "clone" your phone elsewhere, to be used in the future for whatever purpose necessary. Is this possible? I only know what I've seen on TV and the movies. Like...
Imagine if someone at the post office skimmed everyone's credit card as they passed through the mail, and saved the info (as they did in 1992's "Mo' Money" starring Damon Wayans)... so that individual could, at any time, swipe a blank card through a magstrip writer, and "clone" any of the cards that they skimmed for their own use. (I have personally been compromised in this way - being alerted that my debit card was used to purchase high-dollar works of art from a gallery in Canada. I was 16, and attending high school in pennsylvania) Now... swap out the credit cards for cell phone info... and that's one explanation of why kingo does what they do, the way they are doing it... with no noticeable impact to the user. Yet. I don't want to sound dramatic... but, a possibility could exist for an explosive device to be triggered with a burner phone that has been cloned from someone that rooted with kingo. You receive a seemingly random text message from an unknown number... and something explodes somewhere.
</tin foil hat>