Sending argument & Arguments in Mini Panel

What the difference between:

[checkbox] Sending arguments
Select this to send all arguments from the panel directly to the view. If checked, the panel arguments will come after any context arguments above and precede any additional arguments passed in through the Arguments field below. Note that arguments do not include the base URL; only values after the URL or set as placeholders are considered arguments.

and

Arguments:
[textfield]
Additional arguments to send to the view as if they were part of the URL in the form of arg1/arg2/arg3. You may use %0, %1, ..., %N to grab arguments from the URL. Or use @0, @1, @2, ..., @N to use arguments passed into the panel. Note: use these values only as a last resort. In future versions of Panels these may go away.

Because of an issue as reported in http://drupal.org/node/866888, I need to set arguments in the "Arguments" text field. I worry that if in the future, this goes away, I have to work again.

Thanks,