[suicideneil]

Not $$ that much better really- they do have a metal diff cup but it's rare you ever see anyone have issues with the plastic ones ( much better material than traxxas uses... ).

Fairly sure they don't come with the pinion ( you can see the same thing I can regards the description )- rare that diffs ever do like that; you need to hit up ebay in order to get entire diffs which will include the pinion & bearings etc ( see post # 2 in this thread for some examples ).

I doubt very much you'll have issues with the HB diffs though provided they are shimmed correctly + lubed with a little white lithium or automotive grease.