I might be wrong since I haven't bothered to test this since the healing skill update, but I don't think it affected puppets at all similar to BLU healing spells. As Spiritreaver said, MP efficiency is a non issue for PUP. I suppose if you're missing key attachments you could have issues. And anyone who's leveled PUP recently likely is missing some considering many of them are upwards of 2 mil, at least on Siren.