The association master policy is for coverage to the structure, which you don't need. However, to get protection for your own possessions and for legal liability related to your own unit, you need your own policy. Many condominium associations will assess unit owners for master policy deductibles. That's another reason why it is important to have your own policy and why it is important that the coverage in your policy match up well with the association master policy.
Information provided by www.iii.org