I am using a DVX100a for the first time next week and I ordered Panasonic MQ series tape...when I got the camera, the manual suggests "AY-DVM 30/60". I'm guessing/hoping that the MQ tape is fine....
i do use AY-DVM63MQ and I love them very much... now that you shoot with those, keep them. It's very important do keep the same brand of tape for the camcorder.