I have iGaging DROs on my LMS mini-mill, and they have been working OK, but not without problems.? I bought my mill used with the DROs included (aluminum scales), so I'm guessing they were a year or so old when I bought the mill. They worked fine for a couple of years after I bought the mill, and then the vertical scale started acting flaky. I tried all the suggested remedies, and finally just ended up replacing it last year. No problems with the new scale/DRO so far.
Also, the latest iGaging readout is larger and easier to read than the older one. It lacks an auto-off feature, but does have a socket for a USB power supply.
One of my older readouts started getting very hard to switch on, so I replaced it with the another readout I happened to have on hand.
To sum up, I would say that my iGaging DROs worked a good five years before I began to experience problems. As another poster noted, they are plenty accurate for the work I am doing. You can pay a lot more for glass scales and get another digit of accuracy, but is your mill really going to be able to deliver that precision?
Below is a pic of my mill with the 3 iGaging readouts (newer one on the bottom, with a tachometer below that). You can see how much bigger the display is on the "E-Z View DRO".
