I own a Quickrod and it is indeed glorious.
Tilsta's comments are pretty accurate.
I'm not sure what year his friends amp is but imo the newer models have a fantastic clean channel. Mine is a 2016 model which I ordered "fully loaded". Which means it had a "mid" switch which basically changes the mid voicing to be closer to the Nitro model. Which is a more metal type sound.
The old/new switch changes between a different type of "aggression" for lack of a better word. Apparently pre-2006 Scott voiced the amp somehow slightly differently which made the amp a bit more aggressive sounding. I personally like the "old" setting on the amp and that's where I set it.
And thirdly and most importantly there is the Drop B+ switch which gives the amp more "sag" by dropping the plate voltage into a spot like where a Marshall lives. With the switch disengaged the plate voltage is up around 490V with it engaged its around 420V. It makes the amp a bit squishier...in a good way. IMO you want this option.
When people say the amp is unforgiving Knox in Box is pretty accurate. Not sure about the rivets of you're jeans but....lol!!!
It's a very tight and responsive amp and therefore all of the nuances come out....both good and bad. If you're picking technique is sloppy you're gonna know about it really fast.
Customer service is spectacular and build quality is second to none. They are usually a couple/few months behind so be prepared for that when you order. I waited about 8-10 weeks for delivery.
I had never considered the 3 gears sharing the same tone stack as an issue like tilsta stated but now that I think about it, it wouldn't be a bad idea to be able to have that kind of versatility.
There is a Splawn forum but it's barely alive nowadays. There's about a half dozen of us that visit but there's a ton of great reading available if you are so inclined to search.
Feel free to hit me up with any questions you have....I'll do my best to answer for you.