I'm with 4Eyes (hi Colin btw). I use the Digitalquill plugin. The earlier versions up to 2.05 were pretty buggy but 2.05 is fairly decent.
It doesn't handle massive feeds very well, or at least it doesn't on the servers I play around with, but it is extremely easy to configure and uses columns as numbers and you can put a feed in very simply. I tend to break the feed down into smaller size files, but that does make updates difficult to handle. So, if I am honest it's still a tinkering tool for me.
The same developers also have a product for Amazon, but I haven't tried that yet.
Both products are one time purchases and the cost is £25 so the fact they don't provide much support is not that big a deal for me.