I think he has done well, but from what I and other people I know have noticed is that his actual catching technique isn't that good. Notice how close to hisbody he taketheball and the loudcrack you can always hear.
This is the opposite to what Gilchrist, McCullum, Boucher and top keepers do, the catch should almost be like a performance with the arms extending to the ball, with over the top exaggeration, and take the ball in front of the body. This contrary to what ambrose does as he takes the ball in-line with his body.