I bought two of this product to replace two of the two-piece units available on Amazon. I purchased the two-piece units because I wanted to be able to operate the doors easily without having a remote handy, and the competitor product allows the control box to be located where it can be accessed easily. But the quality of the competition units are poor compared to the one-piece Vevor units - and much more expensive. The competition units seemed to have a lot of slop in the drive mechanisms, and the door travel was uneven and jerky. They both finally failed after less than six months of use. The Vevor units are much smoother and quieter, so I'll just keep a broom handle close to each if I need to operate them and don't have a remote with me. Hopefully they will last - the two-year warranty is a huge plus. The competition has no warranty.