The vise is fairly sturdy, the jaws are hardened steel and they stay parallel through the entire length of travel. I am using this on my WEN milling machine, and so far, it has stayed fastened tight to the table through several small jobs. The height of this vise does reduce my drilling capacity by a bit, so I have it on the end of my table instead of in the middle, so I still have room to use T-Slot Clamps in case I need it. The two things I wish this had was a good detente to lock the vise in the 90, 60, and 45 positions when I am rotating it about its base, and a flat edge for me to reference against the milling table. Other than that, very good for the money. Will continue using.