Seems to be well built and with a little imagination I was able to mount this on a HF mini mill (losing about .75" on Y axis). The documentation is atrocious with bad translations from Chinese to English. Its a good value. The DRO itself is decent with arc/bolt hole/etc functions like most other DROs.
I'm thrilled with this DRO, upgrading from the iGauging DRO system I had that broke. The enclosed glass scales are worth the cost and as far more reliable than the capacitive scales I had before. I love the big LED display, making it easy on my aging eyes. The 1/2 button is great for locating the center of a workpiece. This DRO is a great value and its scales are rugged and protected from flying chips.