When I put the belt on the powerbank sits at my side and can be accidentally knocked off. (Poor design placement)
Even as I sat down on my couch and reclined the seat back once I put my arm to my side I was accidentally pushing buttons etc.
I feel like it would be more convenient if the powerbank/controller was actually connected to the belt itself. Rather than some bulky detachable piece held on by weak magnets.
Additionally, the whole belt is very stiff. (Reminds me of the old hard back brace I used to wear.) Very uncomfortable and makes moving around while wearing it impractical.