Short answer: Not mandatory but sensible for single incomes or dependents. Compare to life and income insurance. Read exclusions.
It pays your mortgage if you lose your job, get sick, or die. It is not mandatory but it is sensible if you have dependents or a single income. Compare it to life insurance and income protection — they might cover the same thing cheaper. Read the exclusions carefully. Some policies do not cover redundancy.
Monthly Premium: $80
Coverage: Mortgage payments if unable to work
Alternative: Life insurance $50 + income protection $60
Comparison: Bundled may be cheaper or more expensive