The problem with using ACH is that you can't prevent overdrawing your account. Unless this has the ability to query your bank account and ensure you don't acci

The problem with using ACH is that you can't prevent overdrawing your account. Unless this has the ability to query your bank account and ensure you don't accidentally overdraw, then using a credit card is far superior. At least you will get an error message immediately as opposed to a day or two later.