Marketpress Enduser Documentation?

Is there any sort of end-user manual for Marketpress or a how-to video?

My client about cried when I showed him the store back end (granted…not exactly a computer savvy person). Is there some vid that I looked over that shows how USE the plugin, how to add products, like how to process orders and such? Or should I just roll my own for them?

And, truthfully, I’ve set it up and customized it a few times, but I, personally, have never used it…

any thoughts?