I had the 15XL for about 3 years bought the bose when I starting instructing. If you want a full size headset there is no comparison. The 15xl is good but the noise canceling isn't as good and its hot. It also clamps down on your head. I'm fixin to start flyin a jet for a regional and I'm probably gonna get a telex 750 or 850. The flight school that I work at also has a pretty good sized internet pilot shop and so I have used all different kinds of headsets and if you want a regular sized one that is good for small and big airplanes there is no comparison to the bose.