I get this question quite a bit. Mostly because some poor misinformed borrower has been told they can have an interest rate as low as 1%. Borrowers beware! This is total nonsense and I think the old saying goes something like this: "If it sounds too good to be true, it probably is".
It's definitely true in this case, in my educated opinion. The Option ARM is a gimmick loan that is sold in such a way that it takes advantage of the borrower's lack of knowledge. I believe the Option ARM loan should be illegal to sell; if not illegal, then borrowers should be required to go to a class of some kind, but again that's my opinion.
Here's a few reason's why I think the Option ARM is a Bad Idea:
1. Higher Interest Rates - Yes, that's right your interest rate is actually higher than what you could have gotten on a conforming loan. How? You ask. The low teaser rate your actually paying is only a portion of the interest that's actually accruing on the balance of your loan. Typically Option ARM loans have a combined interest rate of at least 8.25%, but most are even higher than that.
2. Negative Amortization - If the borrower pays the minimum payment every month the balance of the loan will increase. Yes, that's right. The borrower will owe thousands of dollars more on their home in a very short period of time. This again is because the interest rate the borrower actually signed up for is much higher than the teaser rate they think they are paying.
3. Loss in Net Worth - Because the loan balance continues to rise over time, the borrower's equity decreases. Thus, leaving them in a worse place financially in the long run. I had a borrower the other day that was shocked to find out they owed $50,000 more than what they borrowed using a different lender just 3 years ago.

I'm sure there are more reasons than what I've come up with. Please post others if you come up with some. I invite anyone to comment on or dispute my claims.
Michael,
You can't say a blank statement like that. I do agree that most people who went with this loan where misinformed. However if your true rate is in the 8 or higher how much YSP did you get? I think you have to understand what loan really is meant for.
1. Self employed people who need to manager cash flow
2. Jumbo's or super Jumbo's
3. Financially educated people
4. People who need some payment relief and understand that they are using the equity in the house.
Neg am is not a 4 letter word but someone who is finacially savy and want to take advantage of some tax benefits they can. (at the end of the year they can stroke a check for the neg am)