I have the supreme pro x
They are military kit, designed for tank command.. built as you would expect military kit to be built too... Solid metal and heavy duty polymer build, no flimsy plastics...
The electronics are amazing... suffer from wind noise as do they all but not as bad as peltor in my opinion... the sound level is kept constant, so rather than cutting off when a gun goes off, they keep everything at a constant level.. everything happens instantaneously, you don't know anything is/has changed... also, the sound quality is remarkable.. as I said in my last post, if you didn't know you had them on, you wouldn't know you had them on!
Waterproof mics, stupidly long battery life, auto shut off, adjustable volume, input socket for radio or walkie talkie... Also, don't cause (me anyway) any mount problems due to their low profile design.
I sound like a fanboi LOL.. yes, they are expensive.. I've had mine for 2 years now and wouldn't swap them for anything!