It is good to do it. It's basically making an extra payment a year. If your pay schedule is bi-weekly, it is a great thing. If not, it can suck. Remember, this doesn't mean 2 half payments a month, it means literally every two weeks. Twice a year you'll have 3. It will most likely have to be on auto-draft, so don't forget to subtract it from your account every 2 weeks. To me, it sounds like a checkbook balancing nightmare waiting to happen. I've run people an amortization schedule based on the average per year additional towards principle on the bi-weekly, then divide by 12. Your loan officer can do this. Make payments at the first of the month, keep adding the extra that you came up with towards principle. It does the same thing, but it's easier to keep up with in the checkbook. IF you have the stamina to pay that extra.

That's where the auto draft is good on the bi-weekly, you pay it without thinking about it.
For instance, on a $150,000 loan at 5.375% 30 yrs, first payment 9/1/2003:
Regular 360 pymts: payoff 8/1/2033
paid to interest: 152,382.79 (Sucks to see the numbers, doesn't it

)
Biweekly: payoff 7/17/2028
paid to interest: 122,665.68
Save about 5 yrs & $29,717.11 (nice)
On regular monthly payments, Prin & Int = 839.96
Avg monthly on bi-weekly is 419.98 (P&I) every 2 weeks, or averaging $909.96/mo (remember two months you'll pay 3)
That's a difference of $70/mo more. If you stay on monthly, but pay the extra $70, you'll do about the same as biweekly:
pay off 9/1/2028, pay in interest 122,992.86
You pay ~$327 more, over the 30 years, but it may be easier to keep up with. You may be able to setup the auto draft for this too, check with your lender. More than likely, you'll close your loan on monthly payments, but have the option to go on biweekly after you've made your first payment or two.
Boils down to what is best for you, based on your pay schedule, more than anything. Either way you do it, it's a great idea--the sooner the better to start saving.
I don't know what term you're looking at, or loan amount, but if you're ok with paying a little more, like on the bi-weekly, have you investigated going to a shorter term instead? This is a great time to do a 20 yr instead of 30, or 10 instead of 15 and so on. If you'll be paying PMI, each shorter term gets a lower rate for the PMI, so it may help lessen the raised payments some.
Good luck, and good job thinking ahead like that.
