DRO from Shooting Star question

I want to put a DRO on my old Pratt and Whitney 12x30 lathe. I have seen the DRO offered in HSM by "Shooting Star" (I will look up the full name , I don't have the mag. w/me) out of Canada. I understand that it is a rack type of system rather than a glass slide style, perhaps this would explain the lower price, big draw to me as funds are tight. Does anyone have opinions on these DRO or does anyone have experience with one?
Thanks for your help.
Trusting HIM,
Steve Rollert
keenedgeknives.com
doveknives.com