Good product for a while, but cheaply made and will not last
I'm on my third one and am finally realizing it's not bad luck or user error, these are just cheaply made.  The first one had lose screws inside, and despite opening it up and tightening the screws, the screws kept falling out.  Returned it and got another one, which also had loose screws and then stopped powering up. Returned it for a THIRD one, which was great for about 2-3 weeks, and then also started losing power.  Now if I use my arms to pull it tight onto my shoulders, the motor will literally stop because it's so weak.  Pretty frustrating because it's a fantastic design, just cheaply made, and will eventually fail on you.
Rating: 2 stars