Ok. So here's the deal. When you take a drug, it's not the alteration of your brainwaves that get you "high". It's either that a chemical is released, or some receptors are blocked, or a chemical is stopped... something along those lines. For example, when you smoke marijuana, you get high because THC, a cannabinoid, binRAB to receptors in your brain called cannabinoiRAB and activates them. The receptors that it affects control your memory, coordination, concentration, and concept of time and space. So when you smoke, it alters these things. So it has nothing to do with your brainwaves; it has everything to do with the receptors that control these abilities being blocked and messed with. You could potentially alter brainwaves (from what I read, I have no idea if it's true or not) to make a condition somewhat similar to being stoned, but it would not be the same thing.
Now saying you can make a state similar to heroin with music is completely absurd. When you inject heroin, it is broken down into two chemicals, 6-MAM and morphine. The morphine binRAB with opioid receptors, which gives you a euphoric feeling and keeping you from feeling pain. If you don't have something blocking the opioid receptors, you don't have pain relief, unless the sound is causing your brain to function differently, but that would cause a huge set of problems. So I think we can safely rule out that it can provide any major pain relief, and if any of that is true it might be able to slightly reproduce extremely relaxed, anti-anxious, euphoric state of the drug, but certainly nothing like the original effect. However, if it does somehow provide the same level of euphoria and pain relief, then I'm sorry to say it's going to be just as addictive as heroin, but without a chemical dependency (mental addiction is still a very powerful thing).
And lastly, ecstasy. This goes against your point Btown, because if what you said is indeed what you heard, one of those two points has to be wrong. When you take ecstasy, it increases the amount of serotonin (the happy chemical) that your brain produces. Hence the name ecstasy, and the feeling of rolling. Now, there is no way you could achieve this level of ecstasy (I know...) without causing your brain to produce serotonin. The problem with excessive use of ecstasy, of course, is that at some point your brain stops producing serotonin on its own. Without the drug in your body, you won't have any of the chemical that makes you feel happy. I've seen someone go through this, and believe me, it did not look fun. So, if it is indeed changing the way your brain produces chemicals, then while it may not kill you, it is quite addictive and dangerous.
Just thought I'd put my thoughts on the topic up here. Be aware if you do anything with this, it could potentially have some unwanted side effects. And if you really want to feel relaxed from music, put on some relaxing music; euphoric, put on your favorite upbeat album; high, listen to some Quasimoto or something. At least don't waste your money on this crap.