I recommend this paper for acceptance. The paper is on an important and a timely topic and is above the quality bar necessary for acceptance. Although the reviewers had some concerns, the rebuttal clarified their most burning questions. I also thought that the more critical reviews were the less informed ones. Having said that, I strongly suggest to take all comments of the reviewers into account to improve the quality of the camera-ready version, mostly with respect to the organization, the clarity of the paper (including the description of the related work) and including the results provided in the rebuttal.