Not quite as many hours in noisy aeroplanes as TREX, but I can also thoroughly recommend the Sennheiser ANRs.
They're also quite robust. I have had a pair of HMEC400s for the last 6 years and 600 hours of noisy cockpits. A bit scratched, but they still work perfectly.
Top Tip. Get a set of rechargable AA batteries for the ANR box.
I also have a pair of cheap HMs for my occasional passengers. No compatability issues and 'er indoors thinks they are comfortable.
BEX