1) I can't delete columns that I enter. I have tried deactivating other plugins and themes, that didn't fix it. So if I entered 30 cells but then I made one typo I had to start from scratch. Yikes.
2) Columns don't line up. Features that correspond to packages appear on the wrong lines if the feature and packages are different line lengths.
3)The text in the feature column doesn't fit and overflows in to the package column. Like other users said, nice plugin with great potential but unnecessarily time consuming to force the fields to line up.