FTDK - I'm sure that you'll find the H10-20X's will absolutely sh*t all over the X11's in the Bo, even with the ANR off.
I tried a set of Bose in a R985 radial Beaver the other day. Yes, they were nice & light, but they didn't cope well with the noise. My Telex D50's were quieter with the ANR off than the Bose were with the ANR on.
In noisy aircraft I was very disappointed with the performance of the X11's as per my earlier posts. The guy whose X11's I tried wears earplugs under his whilst flying Beavers now.
In a quieter cockpit, such as a Caravan with the front vents closed, the Bose & X11's would be great. Whilst I still fly radials I'm not going to spend around 1k5 on a second headset which I'd only use in quieter aircraft.
"Designer" headsets are not particularly good in "fun aircraft".
W