[abtestdev]

Based on the blog - anyone who shares a IP address (such as inside a company network) would effectively look the same.

[proaralyst]

And given most companies run managed browsers on managed systems, the user agent is going to collide too

[_-___________-_]

Not just inside a company network. CGNAT is pretty commonplace nowadays.

[JackWritesCode]

Indeed. This is one of the limitations to our approach. We're thinking of ways to workaround it. Please shout if you have any ideas ;)

[cameronbrown]

If/When IPv6 is widely used the problem should fade away.