Matrixify

This is extremely useful once you figure out how to do everything. There are lots of tutorials that are helpful. Actually I haven't had to contact customer support at all, which in itself is unusual. Mostly I use it to export products to Amazon - it's by far the best/easiest solution I've found - though you do need to make a few modifications to the spreadsheet, a few fields are missing, but as long as you are proficient with Excel, this is great.