Luckily I haven't run into any issues thus far. The whole bag goes as is into the scanner. So far I haven't even had to get a hand search, knock on wood...
The isolation on Thunderpants is superb, which makes them great for travel (and work). Only drawback is sometimes the attendants have to tap me on the shoulder to break it down and stow for landing, as I often don't hear the announcement...
I definitely stand out in a sea of Bose )
Only people who have commented on the rig so far are a few flight attendants. I know a number of people travel with full sized cans, but I just don't seem to run across them, despite flying roughly monthly.