Talk:Varus/@comment-5284325-20121228061628/@comment-4916873-20121228093909

Firstly, let me quote this from the very same wikia:

" For the combine cost of 865  gold, at maximum stacks,   Guinsoo's Rageblade  gives an additional 32  ability power , and 32%  attack speed , a value of approximately 1900 gold."

This means that average efficiëncy is already obtained at four stacks. In a typical fight you will be detonating more than once, thus you will obtain more stacks on this item than four.

Additionally, Guinsoo's Rageblade allows you to build some AD early on which greatly strengthens your laning phase.

Lastly, Guinsoo's passive offers a very powerful and unique attribute not seen on any other item: it's a form of post-fight sustain aimed for that use and thus very cheap and efficiënt. For a very low amount of money you get the most prominent benefit of sustain: you will be able to recuperate after a large teamfights without going back to base. And let's not forget the small extra attack speed the passive gives you! :)