#1
can someone enlighten me on what they do?

those of you who have had this mod, was it worth it?
#2
They do the exact thing that every other nonpolarized capacitor does, have 2 conductive plates separated by a dielectric

Orange drops are still really cheap so go ahead and just throw em in your axe. As long as the capacitance is the same there shouldn't be any ill effects over ceramic caps.