So here is the deal. I put about 2300 hours on the pair of David Clarks I bought when I first started flight training before the mic stopped working for me, and I therefore sent them in for repair. Meanwhile I ordered a new pair of Lightspeed Mach One inner-ear headsets, which I flew with for the first time today (I fly Twin Otters for Scenic/ Grand Canyon Airlines). Well, the sound quality is great! And they block out the engine noise better then the David Clarks. However, I initially had some problems with the mic, but it seemed to be working for a while, and then on the last flight of the day, as I was reading the taxi check, there was a pop sound, the mic stopped working, and I couldn't communicate with the captain.

So anyway, if I can't get them to work the Lightspeeds may be going back, and I actually just received a brand new pair of David Clarks today. My question is, since I'm probably going to be flying for the next 40 years, what are good choices for the long run? What do pilots who fly larger pressurized aircraft use?