I use to have their 7 port hub but I don't like Dlink as they have proprietory connectors and their power supplies are only US voltage.
The hub I have is similar in shape and footprint to yours only it has 7 ports and is powered by a Nokia phone like charger. It's made by a company called High Edge Technology.
There may be clearance issues with the Dr Bott T3Hub since there isn't much room below where it plugs in so I suspect it might not fit the MacBook Air very well.
Ok so Dr Bott is out of stock on their T3Hub product so does anybody know how it fits the drop down socket on the Air yet then since they are marketing this product as an "air" compatible product.