I have Bertha by Arrow. The magnets to close the doors were in the wrong location. Hubby added a larger metal piece and they close so well. The hinge on the left extension is wobbly, but that too is an easy fix.
The lift works well, the quilt table leaf on the back easily slides and raises up & down for use. I love everything about it. Is it made of cheap stuff? I think so, but no one uses it but me. I have a sheet of vinyl that fits over the left extension arm and over the sewing machine plate (I cut out a place for needle & bobbin change). This serves to protect cabinet, help fabric slide and cost about $3.00 vs. the small/tiny Supreme Slider that only helps the fabric slide a bit. I love my Bertha.