The original Klons are a thing of merriment and joy with the right amps and guitars; so is the KTR; so are several of the klones on the market.
At some point in the '90s a vintage gear dealer offered me a new Klon he'd just bought and didn't like, for $200. I really loved it with single coils and a vintage Fender amp, but I was a humbucker and Mesa player at the time, and didn't think it worked as well with them, so I bought a Fulldrive.
Stupid me, though I will say that projects done with the Fulltone sounded pretty sweet.
However, two of my friends still have the original Klons, and I've been able to use them at their places. That led to me buying my son (a Fender player) a KTR for his birthday just before they went out of production. He uses it with a Mesa Lone Star - an amp I also have here - and it sounds great. It's always on his pedalboard for studio and tours.
Recently I bought an Anderson Telecaster, for a kind of ongoing project. It's the first single coil guitar I've had in a very long time. After I got it, I figured I'd find myself a nice Klon-style pedal, and I glommed onto this:
Introducing CORE Limited Streamlined Sonic Bliss New run! 15 units to ship Late April12 left! SHIPPING: All pedals are made-to-order by our small team of two partners. Current run will ship mid to late April. The RARECore Series Limited Edition Overdrive I just checked and a Silver klon is going...
www.pettyjohnelectronics.com
It uses NOS parts, as the above link details, including some originally used on the Klons. I opted for the Emerson caps to open up the high end. I really like the pedal. It isn't (and isn't really supposed to be) a Klon clone.
However, it does similar things that I find useful, and it sounds very detailed, probably more so than a Klon; it's much like the studio-influenced piece of gear it was designed to be. That's typical of Pettyjohn's gear. Every so often he comes out with something that's kind of a 'must-have' for me.
I use it a a boost with a touch of grit, on 'edge of breakup', just to push an amp a tick or two farther over the top.