I had a Revv 120 and a KSR Ares back to back
they feel quite different
The KSR gain had bigger grains of sand. The low end is phatter. Kind of like a Rectifier but more polished and refined.
The Revv ch4 was a closer comparison to the Ares. Your 100P is based off of the ch3, which to me was much closer to a Modded Marshall thing- flip that contour and bright up and it gets very cameron/fortin-ish in its immediate attack. The low end was seemingly not enough, but in reality, it is really tight and sits in a mix perfectly. That tight low end takes a post eq really well to bring back the thunder if needed. If I plugged into an amp with no pedals, the Revv would be the clear choice.
They each had bright switches. The Revv was more aggressive in affecting the tone like a tube screamer set to 0 gain. The KSR did it too but with less drastic effect- which could be a good thing. The Revv mode switches really delivered a wide range of sounds.
The Revv clean and crunch were each stellaer in their own right.
The Ares mid and low gain worked but I did not feel inspired by it- for me that amp sounded great on the high gain and the different shades. Felt amazing. But not for lo gain.
The Revv felt more transparent in terms of hearing everything you played without mercy. This can be a great thing too, but much different compared to the feel of the KSR.
Both amps were awesome. Hope that kind of helps even though neither is the model you seek info on.