no i do not; i did not use the paid plugin (not keen on asking the client for more money without being able to predict the outcome), however i implemented this for my client, and it works flawlessly (their products are shown in google.de products, and there are no submission errors).
this is what the plugin (code, since it's not a real plugin yet, but i'm working on that) achieves http://dealershop24.de/feed/products/
and this is how it looks in google merchant
http://i.imgur.com/WOau1.png
Hope this helps you make the right choice :)