NR editorialized about it last year.

While conservatives hold a range of views on the details of antitrust policy, they think that most mergers should be allowed to go forward. Some conservatives are especially favorable toward the proposed merger of Sirius and XM, because the companies have agreed to let consumers buy smut-free satellite-radio packages for a reduced rate. Having made this concession to social-conservative groups, the companies have made others to win over liberal organizations (for example, a promise to do educational programming). What troubles us is that all of these side agreements will have the force of federal law: The new company will be a regulated monopoly, with the merger approved on the condition that these agreements be honored. In this case, the cause of smaller government might be better served if the merger does not go through.