13x are fit for the job at a reasonable price you can get spares with no problem the service support by headset services in my experence is top notch.
They are a robust headset which does survive living in a flight bag, getting dropped, sat on, crushed by the fanny running the xray machine who can't be bothered putting flight bags through on a tray.
And the biggest plus is that if you run out of battery (usually on approach where you have no chance of swapping it).guess what?
It turns into a very capable passive dc headset a quick readjust of the intercom and rx volume controls off the minimums which they are usually at. And no problems
its the x11 which I didn't think were up to much