Just went from EGD grips which are very similar to unica now to palm swell lok bogies as I have big hands / long fingers and am very happy with how they fill the hand. Makes the gun feel more like a 2011 in width.
S2 Xtreme AU here. My experience.
All Xtreme parts and medium springs it lights up everything.
Completely stock and trigger gets nice and smooth after use.
100% reliability. I see no reason to change anything on it.