Just want to add a couple of comments here as I have a different take on the Marodyne vib plate. I should say my comments are actually triggered by reading a number of people commenting on their take about the Marodyne device not working, being too expensive and or being a scam.
So, yes, looks like it does not help bone density. A big disappointment. I own one so the reports from Belinda Beck that the VIBMOR study will show no bone density benefits is sure not what I wanted to see.
On the other hand I do not feel tricked or deceived. There is a lot of research behind it. Belinda Beck and the team who did the study had expected it to work. It was not, to the best of my knowledge, a scam. As best I can tell, it came out of valid research projects that did not get a thorough human trial and when it finally did, it did not work. Much research ends with "does not work as hoped and expected". Why no human trial much sooner? I don't know. I also read the Marodyne site just now and I think it's within reason. I wasn't mislead when I bought mine. I did not think NASA was using them in space and had endorsed it or anything like that. The web site and the interviews I listened to with Dr Rubin did not trick me in that way. I knew that there was evidence that it could work but no real trial. Is it "misleading"? What they do in the future after the VIBMOR study is released will perhaps indicate "the stuff they are made of".

Point two. It seems that vibration can be dangerous and that those cheap plates might not be such a good idea safety wise. A big part of the idea behind the Marodyne was to make something that could stimulate bone and yet be safe. Most of my information on this does come from the Marodyne's developer Dr Clinton Rubin. I did read a bit beyond what he had to say on the topic and it seemed to support the idea of potential harmful effects from vibration. But basically I am not knowledgeable on the topic. Still, I wouldn't suggest anyone rush out and buy a vib plate of any kind or of any cost.

To my knowledge none of the cheaper vib plates folks are suggesting have ever been studied and shown to improve bone (and to be safe). So we have one expensive plate the Marodyne that was designed specifically to improve bone with a safe level of vibration and it looks now like it does not work. Why then rush out and buy a cheaper plate with likely no bone research behind it, that has maybe never been studied at all and expect that to work?

BTW, that vibrant health site you list does not appear to have anything to do with vibration plates.