Like any of these trolley systems, they are a challenge to install, particularly with one person. However, after installed they work just fine, and it does the job. Very simple device, seems well built, although I haven't had much time to use it.
We did not want to permanently mount our heavy hitting bag. Since I have a steel beam in our basement I purchased this to use. It works great and allows for the bag to be moved out of the way.
Love these use to make my own but after finding these I can’t build them for as cheap as I can buy from vevor. Plus the quality is very good. I was thinking no way these be good for the price so I bought one then 6 more.
Absolutely love these trolleys built a shop bridge crane hoist with them have 6-8 of them haven’t let me down test build quality is amazing plus vevor shipping is crazy fast too
dzimmerle 
