Quick charging is great for boosting a low battery, but doesn't give much of a gain overall when charging to 100%. Don't get me wrong, I like having it, but I've done some extra reading on charging Li-ion.
All lithium chargers go through stages. Once you hit about 75-80%, the charge rate slows. Think of it like filling a bucket. If you keep the water hose on full blast, it'll start spilling over before it's completely full. If you reduce the water pressure, it won't spill over and you can fill it right to the top. It's a similar principle at the chemical level with batteries. From what I've read, the quicker the charge rate in the first stage, the slower the charge rate in the second. (The third stage being the float charge to keep it at 100%)
And if you look at the marketing for QC2.0/3.0, they don't advertise quicker full charging. They are only advertising quicker from 0-80% or so. I do think I'll be getting the V20 and looking forward to checking out the bigger battery options. That plus quick charging will be sweet. Depending on size and my usage, I could see a case of charging it for less time yet getting over the stock 3200mAh capacity because the bigger battery would allow for higher capacity before hitting the slower second stage.