The announcements for today say the new USPS shipping module is available. I looked at the install/download page and it says "This is the upgrade for USPS January 22, 2012"
It also says for 1.5.0.
I'm on 1.3.9h and plan on staying for a few more months. So first question - does this upgrade apply to 1.3.9h?
Second question - before I go and remove the old, install the new - I'm wondering just what it's supposed to do. I only have US shipping turned on in my (now old) USPS module. I offer priority, first class, parcel post (and free shipping from the free shipping module.) Orders received today have the new rates on them. I went in posing as a customer and got quotes on a few carts, went to the USPS website and compared them to the quotes there - they are updated.

So if I'm getting the right postage costs with the current module, is there a reason for me to upgrade?