AmpCoil worthwhile or worthless?

I've had a demo but that's all so far. But a local family has one and has seen amazing benefits. The daughter was able to go back to college after about 5 years, and work too. I don't like that the company pays for demos and testimonials. But the difference in this local family is impressive.

I don't have an AmpCoil, so that might affect the weight of my opinion, but I'm in several groups and have heard a lot of experiences with AmpCoil. First, AmpCoil is an MLM, which they don't advertise, and I find the secretiveness shady. Second, I was interested in one, contacted the company about a demo, and within a few minutes, got an email asking me for my phone number so we could discuss financing options. I found this to be a hard-core sales pitch, which really turned me off. I also have read experiences in my groups from people who've done well initially, then went the other way. I've also read experiences where they've changed the programs in the software that controls the device, so the folks no longer have access to the programs that were previously helping them. I've also heard experiences where AmpCoil threatens folks who post negative experiences with the product. And finally, I know this sounds a little crazy, but I wonder if maybe some of the programs in their proprietary software do something similar to "brainwashing" their users. I watched a guy in a group get an AmpCoil, say initially he wasn't sure it was working (very objective), then he was doing great (which is what made me interested, initially). Now, if anyone questions the company or efficacy of the device, he goes off the deep end, deletes people from the group (he's the Admin) and acts all-around a little nuts about anyone saying anything other than how amazing it is. He became completely irrational about it. It was very odd to watch the transformation. And I've heard that this is not an isolated thing with just this guy. It's kinda creepy.

I'm honestly still intrigued by it, but am also very wary.