Used Sennheisers and broke them at a rate of around 1.2 a year until i got my Telex 850ANR, have no problem there and works like a charm, havent broken it in now 2 years.
The 737 has no real usefull intercom system, with some of them you can have it open if your yoke switch still allows to lock intercom on, we had to remove that on request of the authority. Apart from that just talk to the other guy, its still possible .)