User blog comment:Willbachbakal/(Item Concept) Crowd Control/@comment-24501229-20150101104758

I don't fully agree with your viewpoint here. These items granting a spell shield active isn't a bad design, but I don't think it needs to change. QSS is a relatively large investment and a setback, particularly for gold-rich roles like the ADC that often get to fill up their item slots. Also, QSS isn't perfect, has a long cooldown, and you still take damage from the spell (while spell shields block them outright). You'll often still get CCed for a split second, and any follow-up CC after the effect wears off will still hit you. That's 1k+ gold for something that might not even be relevant.

In regards to the CC versus Tenacity problem, I'm pretty sure Riot has mentioned that they will revamp the system eventually. Suppression is going to be removed, but I don't remember how they will deal with tenacity. Indeed, it seems a little unfair that so many new champions are getting  the knock-up effects that used to be a rarity.

Small suggestion: maybe boots of swiftness could be given a Highlander-esque active? "For 4 seconds, the effect of slows are reduced by 75%." That would give it its own niche compared to mercury treads.

Phase looks good. Maybe 1.5-2 seconds would still be OK, although the cooldown could be increased at the same time. Even if it sounds OP, flash and ignite has been top picks since the dawn of time. Using flash to dodge an ability is effectively the same as "ignoring damage and crowd control".

Summary: Tenacity = nay, CC removal = maybe some other fix would be better, Cleanse = aye I like it