The problem with it being a toolbar is described here: http://forum.avast.com/index.php?topic=72084.msg605205#msg605205

As for it’s usefulness, well that is a personal thing. You have to decide whether you want it or not. If you don’t then fine.

Can’t you just right click on the toolbar area and uncheck the webrep one?
Can’t exactly test right now, I’m on linux…