Well you can adapt any coding to suit your specific needs I do not personally talking with lots of customers over the years see anyone have a great need to display a feed for one product.
Now things have changed alot in the program so you probally want to check that out. There are actually
There are two RSS feeds in our present script. There is external.php which shows products. There is reviewrss.php which shows reviews.
Both scripts can either show the last 50 reviews, Last 50 reviews from one specific category. Last 50 reviews from one specific user.