It's a little confusing, maybe this will help.
The (Quality: _%) refers to the amount of compression applied in express. For eg., it will read 100% ONLY when the file size is less than or = to to an SL disc, ie., no compression is applied.
Here's an example, Pirates of the Caribbean:
Format capacity: 7.51GB (8.06GB)
The first is complete disc and the second main movie. You can see in this particular example that there is not much difference in compression, ie., the "extras" just didn't add much to the file size.
BTW, if the start button is active, then it's "ready".