Ive replaced the front arms on my T4 with RPM arms from the nitro GT2 truck and yes Id agree that they are very close to being bullet proof. I'm racing indoors (carpet offroad) while the snow is falling up here in Canada. I was breaking a front arm almost everytime on the track, until I replaced the factory arms with RPM arms and haven't broken one yet...
I highly recommend RPM products as they are lighter and stronger then the stock replacements.