I have a MAD I got online as well and the experience is a bit subpar, lots of parts broke (the bands) and I can’t easily get replacements parts. My MAD also broke, and I can’t replace it easily (they sent me a new one but it doesn’t fit). They also are not testing me to see if there’s any difference (I think it works because I wake up less, and definitely wake up less to pee). Figuring out what band to use is also a esoteric process. It’s amazing that this exists besides a CPAP but we are really beta testers at this point. Oh and I learned later that they don’t replace your retainers