IPv6: Have you noticed increase in positive user experience?

I have once watched a YouTube video describing the only actual case of why you should move to IPv6 (apart from your org. being so big that v4 is simply not enough).

So he broke it into 4 boxes, with the following:

- Being an ISP with v6 on.

- Being an ISP with no v6.

- Being a content provider with v6.

- Being a content provider with no v6.

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So the 2 items are a bit straightforward, if you are a decent ISP you will offer v6. However, the question remains on the content providers. "Why should you go in the hassle of dual stacking?".

The only decent answer is speed. IPv4 relies heavily on NAT and NAT introduces delay. So much delay that Google has calculated it costs them thousands of dollars per millisecond. If the elimination of NAT increases 10-15% response time, this means better revenue because the experience is better.

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Therefore my question is:

People who have implemented v6, were you actually able to measure this? Is this statement true?