so ive tried out the complete build. and I must say that the boots and everything else is great. good job :]

Rushing Shyrelia's helps your teamfights really :) +1 from me

Yeah, its very rare for me to feel a need merc treads though.

Usually when I'm against heavy CC, I find that I'm usually being focused as the first target to take down so I die before they finish using all of their CC, in those cases I go for a defensive item first.
Instead, in order to compensate for the lack of merc, or until I decide to get merc, I keep a close eye on CC that I can flash away from or shy away from groups that have proven to be able to kill me before I recover. For example, Taric's CC, you can see it comming towards you and if you flash right before it hits you, you can potentially be relatively safe because it has that much more distance to cover to hit you and it would wear off by the time he or who he was timing it with could catch up. Then Celerity and Shurelya's could get you back to safety.

I think its mostly an issue of how comfortable you are with not having the CC reduction from Mercury Treads. On one hand, you have the CC reduction that gives you a better chance of recovering fast enough to survive. On the other, you have the mobility that allows you to get in and out of situations relatively fast.

I have added an additional chapter to my guide about my views of boots and how they effect this build.

Awesome guide i went 20-1 with this guide! awesome keep up the great work!!!!

I must say that when I first looked at your items, summoner spells, and rune selection I was slightly baffled. But I realized where your going with this build once I read the whole thing. Bravo. I like it. Its a very unique and it looks to be a suitable new build for her. I am going to try it. I have been playing Sona ever since she came out. When my clan and I play its almost always GG. Without the Locket and since the nerf I have been struggling to find a new build. So do you ever get Merc instead of Mobility if there is heavy CC that your having to counter? I have found that building Sona to survive is the best way to win the game. I have however, never tried this out before today.

Again Bravo. I indeed like it very much. I just got 10/3/17 with all my stacks I was mobbing that place like the Bawss. The trick in team fights is to KS a lot unfortunately to get those stacks...and you may have to apologize to your team mates but hey if your putting out massive heals, massive dps and keeping everyone alive they cant complain. I however like to keep my spells as Flash and Clairvoyance. Again great job

really nice build, Sona is a great champion