Just a clarification: ESN is where a lot of rubbers are made. Many of them from European companies.
Butterfly rubbers are not made in the ESN factory and are not made by ESN. Butterfly has their own factory where Butterfly rubbers are made.
But Tibhar rubbers like the Evolution series (ie MX-P) are made by ESN.
The rubbers may have some similar qualities. But they are made by different processes. Some of this is also why the performance on Butterfly rubbers is so different than rubbers made at the ESN factory and why Butterfly rubbers seem to hold their performance for a notable amount more playing time than ESN rubbers do.
My experience with MX-P and FX-P is that, after about 3 weeks to a month of use, those rubbers have this drop off in how alive the rubber feels (when the tuning effect wears off). They are still good rubbers after the tuning effect wears off. I personally like them better after. But in my experience of using Butterfly rubbers, I did not feel any such drop off in the feeling of aliveness happens for a T05 or T05fx and I most definitely felt it with Evolution rubbers and Rasanter rubbers (to add another example of a rubber that came from the ESN factory).