User blog comment:Leyrann/Why Chalice of Harmony is OP/@comment-5194571-20120827200804/@comment-91.120.13.74-20120828074251

Most tops will not go OOM if you don't spam. I know you said that with this item, you can spam your skills, but getting this prevents you from getting much more useful items that may be critical to your laning. For example, if you face a renekton top and get this, you'll probably get stomped on early. Sure, you could poke him in theory, but nothing really prevents him from jumping on you straight and stunraping you, as you'll have no armor or additional health. And absolutely no damage to trade with him. Same thing if you face a Riven. Good luck building a chalice vs her. The list goes on. I could see the benefits of getting it on Yorick, but I'd rather just build a manamune first or go tankier with a glacial. Both give enough mana to stay in lane for a while if you don't spam mindlessly, and by the time you go oom, you can actually buy something in the shop as well and pushed your lane to the enemy turret.

TL;DR: You could get it on SOME tops, but even then, there are better items to get early game, that support your laning.