Michiginman.....
I ordered a DRO from the aforementioned Ali-Express vendor. The ordering process was very straightforward, and since I was paying with PayPal, I was concerned about fraud. Actually, Ali-Express, and that particular vendor have a very good reputation. That being said, I had ordered a 3 axis system for my mill, but it came with a two axis head. It did come with the 3 scales cut exactly to my requested lengths. The seller eventually did send me the correct head and due to the shipping cost back, told me to keep the two axis readout.
20/20 hindsight, I still would have bought from the seller but instead would have ordered from him but purchased the Easson or Sinpro. I find the numbers on the other displays hard to read in a bright area, especially with sunshine coming through the windows.
I know others will not agree with me, but DRO Pros are just repackaging the same Chinese stuff and selling it at a higher cost. With that higher cost comes better tech support though. It all depends on what is important to you and how much extra cash you have.
Precision Matthews also sells Easson and other brands of DROs, and they provide excellent support.