impression Share at Product Group level.
Impression Share Information at Product Group Level for Shopping Campaigns is missing.
Please add this feature as it's what we use in Google Adwords to manage the spend on various categories. Currently I can't do much in Bing because I have no visibility.
Impression share metric is available in both product partition/product dimension report now
Pretty ridiculous that this isn't available. I also manage all of Google's shopping campaigns on the product group level (setting max. CPCs product group by product group), and to not be able to tell within ad groups what's going on makes things much more difficult!
Here's to hoping...