It has been quite some time that I updated WAAT. The released version has been working well - but it does have its limitations as listed in the FAQs on github.
The biggest limitation I feel about the current release version of WAAT is that it does not work in a pure https kind of an environment. (http://essenceoftesting.blogspot.in/2011/06/waat-and-https.html)
Of late I have been spiking out different ways to overcome this limitation. I have experimented to create a HttpsSniffer, and hit various different road-blocks in that. That has forced me to look at another strategy.
If you are facing this similar issue in a pure https environment for web analytics testing, look out for more information in this space.
My plan is to update WAAT, followed-by WAAT-Ruby and then lastly release a new version of the WAAT-Ruby gem following that.