Yes, KOT is as good as advertised. Of course nothing is the perfect pedal, and sticking it between a cheap Guitar and Amp isn't going to do anything. With my amps at edge of breakup and my Guitars with great pickups it simply gives you "more" of the amp without color. It was based off the Bluesbreaker, just like most other overdrives are based on the Tube Screamer.
For anyone curious, you could try a prince of tone, which is a mass produced single side of the pedal, to see if you want to wait for the full deal or if it's not for you.
Also, IMO, Analog Mike Pierra is the best in the business. He's been doing pedals since most of these boutique startups were in middle school.