I've had a quick look at this and I see first, that it more than a year old and secondly is not as comprehensive as the Adobe TV reference I've given you.
An important feature which is highlighted in my reference is the ability to manipulate the grey scale by the use of the saturation sliders in the HSL panel. This cannot be done using just the B&W tonal controls. Also it allows you to add back colour to a B&W image. It's worth spending the 13 min to go through this video tutorial and there are other similar ones from Julieanne Kost.
Hope that helps.