VK2
I also use the QT Halo's and have found them to be awesome. You can get custom ear inserts made locally but I've found the standard foam ones work fine for me. But then everyone's ears are different! I did find in the beginning that it took a bit of practice to get them set up and in properly. This is vital because no matter how good they are, they simplly won't work properly or will feel uncomfortable if not seated correctly. You'll find a 'system' that works well and then it'll become habit and they pop strait in. My 'system' consists of rolling the foam between the fingers until its quite narrow, using opposite hand 'over the head' to pull the top of my ear back and then twist the plug in, they quickly expand and bob's your uncle. On long trips, nothing compares, sorry to say but even bose's don't for mine. You get to the other end with cool, unsweaty ears, no 'vice clamp syndrome', no noise hangover and they stow in tiny places.
Reason I tried them initially was because I'm fairly tall and I kept bumping my head on the roof/canopy with 'normal' headsets, with these I gain around an inch of headroom and can even wear a cap and sunnies together in total comfort!
The Halos are a tad different to others in that they don't have the speakers on the earpiece but rather they're back on the brace and sound travels down an accoustic sound tube and thru the earplug. This means no wires to get damaged in those sections thru heavy use either. One grip I have with them is the mic boom, its a tad short and even though it utilises a stage quality mic, its directional and has to be 'pointed' at the right spot, together with the short mic, this means you might have to practice speaking out the side of your mouth ala stallone. However, the mic quality is awesome. The designer is the same guy who designed the clarity aloft sets and then left to do his own, he's a hearing aid specialist and pilot.
Not a bad option for less than 300 bucks, I hear the aeros guys are loving em for obvious reasons!