The scope came from Enco a few days ago.
It took some fiddling to figure out how to use it, but it does work.
It's not as large as I had feared.
It takes about 3" from tip of the collet or chuck holding it to the work surface. I was not able to use it in a 3/8" R8 collet without extending the quill, as the calibration routine starts with sighting with the dogleg arm along the table (parallel to the T-slots). In the one direction (arm to the left), all is clear and getting one's right eye to the eyepiece isn't a problem. In the other direction (arm to the right), the quill handwheel is in the way. With the quill down or a long collet in place, one can get it far enough down to get the left eye to the eyepiece.
The dogleg with the eyepiece is about 5/8" in diameter and 3" long.
Only the big knurled knob is adjustable. The black eyepiece is not adjustable, and one focuses by moving the quill or knee up and down.
The optical system seems well-corrected, well enough for such uses. The whole image circle is crisp.
It does seem worth the $170.00.
Once I got it aligned the first time, finding scribed crosses was easy, and so the scope is proving to be a timesaver.
Joe Gwinn