One of the first things visitors look for is the star rating and number of reviews. This gives them some good insight into the 'social proof' of the item they are looking at, but it doesn't tell the full store.
They can now see the full picture only by having to hover their mouse over the Summary Widget. Here's an example
The customers can also directly The Review Hover Chart is automatically enabled, so there's nothing you need to do, but sit back and watch those sales roll in.