I´ve played with a factory sample of this several months ago.
For me, the decision between this and an Evolution FX-D depends on whether you like the reduced catapult of Hybrid rubbers in general or not.
The advantage over harder hybrid rubbers is that you must not play every ball in an active way - less sticky than K3 and with the softer sponge a passive block can be played, where with a harder rubber you may feel forced to play counterspin/spinblock.
Otherwise, the characteristics are Hybrid typical. Good to produce shorter services than with a rubber that has more catapult, also good for pushing.
Soft sponge easily enables opening shots on underspin, spin generation is good.
Can´t compare to "regular" version since I didn´t try that, and the Pro version was too hard for my liking.
The FX version might well be the desired rubber of many, bringing "Hybrid to the masses". ;-)