I'm actually in the market for another Bluetooth hearing protection solution myself. My previous kludge stopped working and I've had to go back to ear buds under hearing protectors -- which frankly sucks.
The ISOtunes have been on my radar and I've been watching what the other tool reviewers think. I've seen a lot of "oh, I'm trying out these ISOtunes pro ear buds today," but I haven't seen anybody actually follow up and say how they worked.
When we were hanging out at the airport after the Milwaukee event, Paul (Toolpig) let us try his Bose noise canceling headphones, so now I've been spoiled. I think they were these ones:
I'm not sure if they were the 25 or 35s