By far the most naturally sounding RAT simulation, which I've heard up to now. Works great in front of vintage amps, but also works great to beef up modern amps, in my opinion with sonically better results than you can get with a Tube Screamer (simulation).
The same great sonic quality as the Nembrini Clon Minotaur, which is one of my favorite overdrive pedal simulations up to now. Even better, that Nembrini Audio offers so good sounding pedals for free.
An OCD or maybe also a COT50, SHO or Zendrive II simulation also would be fine in this quality.