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owl-
Just better looking and type of operation by replaceable modules. Motion detection, time delay etc. Also prevents draughts but that's achievable with any fan from the outside of the building if you have access.
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as previously suggested, unless you know the model ref. of your existing it's a bit of a lottery on extraction rate - what if you randomly buy an airflow with a lower m/s flow than present..?
Airhead
rive_gauche
I've mentioned one on here before, the Airflow. You can choose a module for different types of use. It will probably fit the hole as they're usually one of 2 sizes.