I used a 5 year I/O for 2 1/2 years,improved my cash flow when I could really take advantage of it , paid it off and got home ownership mortgage free! That makes me the expert on I/O. IMHO. It is on the thread I linked in a earlier post on this thread.
BTW just teasing about the expert stuff.
Except for the rich it is a recipe for disaster in todays market. Temecula guy nailed the appropriate time frame for the rest of us, 3-5 years ago with an exit strategy.