Good write up, Francis.
I just have to say when I purchased this app, it killed me to buy it, but ONLY because I hate admitting defeat. Cause I love tinkering and figuring out hacks for myself so I spent months trying to figure out the EFS unlock on my own but I'm no uber hacker so I finally gave up.
So i researched some various unlock services and after I came across this app mentioned on xda and knew it was same dev as Gt tools. I knew it'd be reliable, and had no problem paying to support these devs. They're great. These guys got great support and help; and are always improving on their service. And you never need to worry about accidentally locking your device by bad flashing, just unlock it again.
I recommend this service to everyone I come across that needs unlock service. Thank you all at Idone for your ongoing support and service!
And Happy Holidays!