The previous owners of my first house held a lower rate balloon mortgage. The house was a fixer-upper, and we figured there would be no problem refinancing in 5 years when the balloon burst.
We were young ( 18 and 19), and this was a good opportunity.
Until the 5 years was up- and we tried to get a loan. It seems there was something with the zoning being commercial, but the residence was grandfathered in.. and no one, and I mean NO ONE would give us a loan. You know that commercial that says " When everyone else says no, we say yes"? They lied LOL
Luckily, the previous owners were willing to extend the loan, otherwise they would have gotten the house back, and I'd have been very homeless. A few years later, I was able to get a home equity loan to pay off the mortgage. Even that was tricky, though.
Anyway, I'd not recommend a balloon in todays shaky market. You never know what the house will be appraised for 5 or 10 years from now, which could mean the difference between refinancing or foreclosure.