I've talked to my therapist about doing it with him in the know. He's done it himself as a client and had a really good experience with it. In the end I decided not to do it because I realized if I'm on the drug I want to party, and doing this in a therapeutic context is going in to do serious work. Apparently, the protocol that's established is for taking MDMA to be combined with a multi hour session with more than one therapist, so it's a serious deal and a real commitment. You also don't want to be in the position of the session ending and you needing more help and your therapist just can't because of other obligations. Short story, work with your therapist to see if you can find a way to do it together. But don't take it lightly, taking it in the context of therapy is a totally different thing.