My largest client has been is this beta test for the last 6 months. You are not charged for an expansion, and to date, the expansion % has been very low. We used to be able to track conversion perfectly, but then Google gave us new code to make tracking even more accurate and guess what - now the tracking does not work at all I've not heard of a fix. These beta products that are in release are really untested and it's getting more and more unacceptable to fund Google's learnings on our dime. I feel Google should really be sharing some of the cost here. And there was a pretty serious issue with this expansion ads beta last week and our conversion was awful that day - no compensation from Google.