Yes.. been playing with one these for about 6 months. I really like it. The 2 main reasons I switched from a commtac: I usually use comms with the guys I shoot with and I was tired of a full blown headset up against the rifle stock.. The difference in "brain squeeze" after a few hours is worth it alone. As far as the unit itself, it's compact and seems to be built well. You can clip it on your shirt/jacket/chest rig or just stuff it a pocket. It comes with multiple size foamies to "fit most". The hear-thru has four levels of audio volume from conversation level to holy shit I heard a mouse fart at 200yds..
It cuts out rifle noise as good as any other electronic gizmo I've tried. A few cons, depending on the user.. having wires all over you.. if you're not using comms, then it's just earbuds. Add comms, add another cable. No biggie for me. Some may not like that. It uses a single AAA, and burns them up QUICK.
The sticker shock is a bit of an ouch. I think Bison Tactical has the for $249 (iirc) all in all, I really like it. It's my primary shooting gizmo now. I hear there are some new models coming from Silynx too.