I have now tried the Bose, the DC X11's as well as the Telex D50's that I own.
In a noisy aircraft (Beaver with a radial engine) the D50's provide the best noise attenuation by far. The ANR in the Bose seems to better than the ANR in the DC's, but with the Bose switched off you get very little attenuation.
Both the DC's & Bose are a lot lighter than the Telex. I find the Telex to be very comfortable even in tropical low 30's temperatures, however the longest I tend to fly is only about an hour and a half at a time. I can't comment on how comfortable the DC's & Bose are for extended periods as I end up putting the Telex straight back on.
W