I was in a test panel for new headsets when we bought the incredibly noisy 737NG and tried many different kinds. I also tried one type with in-ear pieces like the one under cover cops use.
I most strongly suggest to stay away from the ones that have something that goes into the ear canal. It can often give you eczema in the ear canal which is very painful, believe me,
Or as my ear doctor said: "You can put anything you like into your ear as long as it goes no further than how far in you can put your own elbow"