Great information!  I wish I had known about this product a while back when I was trying to replace some zippers on a backpack.  I bought one of those hand-held, batter-powered sewing machine thingies and it is a total POS for making repairs on heavy material and/or complicated sewing jobs.  
I ended up just trying to superglue the zippers on the pack, and amazingly enough, that worked!  I think a combination of using superglue and this sewing tool would be just the ticket for projects like these.