@trixiegirl I get that the Marodyne is expensive and that makes other vibration plates tempting. But to my knowledge none of the other vib plates were designed with bones in mind nor studied with bones in mind. I read a paper by the VT007 maker and I could see a number of flaws in his logic and a misrepresentation of Clinton Rubin and his work. And I'm no engineer at all, just reading carefully both the VT007 guy's paper and having listened to and read Dr Rubin's work. Dr Rubin's credentials are really solid, way way beyond VT007 person being an engineer. See https://www.stonybrook.edu/commcms/bme/people/c_rubin.php if you're interested.

All that said I own a Marodyne and it did not seem to help me. And more importantly Belinda Beck of the LIFTMOR and VIBMOR trials has said in recent interviews that the Marodyne did not have any effect they could detect on bone density in the VIBMOR trial. Results of the trial are not yet published but she has stated this in more than one interview. Perhaps it has other good effects but at this point I would not recommend the Marodyne or any vibration plate to anyone.

The studies that have shown improvements in bone density have used intense weight training using movements like squats and deadlifts and impact from jumping (or hopping) and landing with force. My favorite examples are the LIFTMOR and related trials by Belinda Beck in Australia. I think it's also unknown if weighted vests help much. No definitive study. I'm using one with fingers crossed.
Good luck to all of us with bone loss