The major downside of this guide as I see it is the late capping of the chains. It is a very effective way to chase down a feeling enemy, or give your carry time to escape, as well as keep your enemies inside AoE ults for at least a little longer.
Thanks for your guide! I had a hard time at first figuring out which items to get in the early game and your suggestions helped a lot.
Will try this more and give my insights, but I can already say that I find Metallo's Heart is a must, no matter th