I just received my rumblex 4D today. I have already used it twice. I really like the quality of the product and I hope it gives me the results I'm looking for!
Initial impressions are that this is a high-quality device. It seems sturdy and built to last. I have briefly run a few modes but require more time with the device to really determine its effectiveness for me.
I have been using this for ~5 days and so far, it has been great. I feel more flexible and have less stiffness in my joints. Looking forward to continuing to explore it!