I don't know anyone at the company, but I do read their blog, follow on twitter, etc. and think they're probably great guys. But this tweet just said it all for me:

"Consumers who wish to opt out of all KISSmetrics tracking can use the free tools http://adblockplus.org & https://easylist.adblockplus.org/

It's completely absurd that people have to download anything to not be tracked - whether the data is anonymous, not shared between clients, etc. As mentioned, they are purposely defeating user intent. What about the next company after KISSmetrics that isn't as "ethical" w/ user data? That's why this type of thing needs to be stopped dead.

EDIT: little more clarity