I'm amazed at how comprehensive DCG is! It's almost the perfect solution for both lay users and experts alike. I especially love the flexibility in NOT having to select a Feature Image. It does so well in finding both text and image content with little fuss.
DIFFICULT POST ID SELECTION
The one game-stopper is the difficulty in manual selection of IDs for posts. Even for an advanced user, having to find post IDs and then go to the DCG settings to manually enter IDs is a pain, especially when this setting must change often. For clients and lay users, it's near impossible.
RECIPE FOR FAILURE
This is my client's situation (and I imagine many other lay users too). I can't ask my client to do all of the above steps. It's a recipe for users avoiding the amazing DCG because it's too time consuming/confusing to manually select posts.
There is one obvious solution: add a checkbox to the DCG post edit page sidebar block to manually select a particular post for DCG display.
Follow up with a new table column in the Post/Page overview page so that a user can easily scan down the list of available posts and see which ones are selected.