I recently bought this pedal, not with the intention of getting a RAT clone, I just wanted a good distortion on my pedalboard which I can use on any amp's clean channel in case where I don't have my own amp around.
In the end I can say that I am quite satisfied with it. The only aspect I find a bit disappointing is that I feel it lacks the strength I thought it would have. You can dial in quite a lot of distortion from the gain knob, but I still wanted it to be more "punchy", forceful. However, it is not a deal breaker in my opinion, as it can easily be fixed with an overdrive in front. I'm currently using the Zeus Overdrive from TC to boost it and I'm getting very good results. The overdrive is quite transparent and I feel that the Magus Pro does not loose any of it's character.
Apart from this, the tone itself is really good. There is a noticeable difference between the 3 switchable modes. The turbo mode sticks out the most I think, but I prefer the classic mode overall. I also like how the Filter knob works, as it is not the typical "tone" knob from other pedals.
Overall, I am happy with, even though I've yet to use it live, I think it's a good and useful distortion tone.