You should not refinance a pay option arm. In other words, it is not in you best interests to do so.
Many people think that paying on the teaser rate of 1.75-3.5 % will only result in negative ammortization, which will be far surpassed by "fixed" appreciation. Given this supposed inevitability, they would be able to refinance at a fixed rate in a 1-3 yr period possibly with another pay option arm (or sale to another buyer).
This could conceivably work in a rapidly appreciating marketplace, but that is not something to count on.
Obviously I am into giving conservative advice. The kind that might be most liked by first or second time homebuyers. More economically aggressive people such as business owners or realestate speculators will want to pursue more liberal mortgage options like ineterst only loans or the POA.