I'm using the Telex 850 ANR and im quite pleased with it on the 733. Draws the power from the mic power and that works perfectly as long as you don't key the handmike or use the mask.
Lightweight, very comfortable even on longer sectors and no problems to understand the guy on the other side or the girl providing the coffee with both cups over the ears.´
We have company provided Sennheiser HME 45 (i think, older ones) and those were very uncomfortable.