They're very reliable, in general. The electronic components rarely "release the smoke".
Normally it's battery leaks that kill them. LCD's may degrade and go brown, or the gear train may get gummed up.
But any movement can be broken by impact, it just varies on case design and how well the movement has been designed against shock.
Normally it's battery leaks that kill them. LCD's may degrade and go brown, or the gear train may get gummed up.
But any movement can be broken by impact, it just varies on case design and how well the movement has been designed against shock.