Great little unit
I've tried so many different things for my back including the back posture brace which I did not like since it was bulky and painful... But this little devise works WONDERS. I've already noticed results after 1 week and everyone else has as well. I have no more neck and shoulder pain and I barely notice its even there. Some reviews said that it gets annoying and it can be annoying at times but isn't that the whole point of it? If it wasn't annoying, you wouldn't sit up straight everytime if vibrated. It has great features too where you could adjust how strict you want it which I like too. It's just overall amazing!