David: What do we think of this.....?
Good use of the space. I think you can move the speakers about a foot away from the wall on either side, towards the television, and you'll get an even better focus of your sound relative to where you are seated. And I suspect the standing lamp on the right might balance the effect of the recess on the left, though you won't have any bass damping issues with those speakers.
Try experimenting with moving the speakers a little and I think you'll be surprised at the effect.
Given the proportions of the room, I think you're quite close to the Cardas ideal. Have a look at this link:
http://www.cardas.com/content.php?area=insights&content_id=26&pagestring=Room+Setup
I'm sure you have a very pleasant sound from your TV with this setup.