I don't have a taig style lathe, but I did go with a DRO on my metal lathe I make cues on.
I looked into these cheap-o style DRO you linked and my biggest concern with them was the accuracy. On the listing, they claim accuracy to 0.002, in my opinion that's piss poor accuracy as far as machining cues goes, especially when you need joints and pins to be realistically below 0.001. So an accuracy of 0.002 doesn't come close to cutting it. And if you're going to double check with a caliper every single time you do something, why even bother with DRO?
I went with a cheaper chinese full size DRO head-unit, and slimline glass scales. It costed like $500 all said and done, but it's claimed accuracy is 0.0002, which is MILES more accurate than 0.002, and I've tested and confirmed my DRO is more accurate than my dial indicators.
So, my personal opinion is the DRO you linked is more of a toy if you're trying to do real precision machining. Either go with a cheaper, but more accurate chinese DRO, or just use graduation dials and calipers and save the headaches of toy-level technology. I am sure a lot of other people looked into these and came to the same conclusion, which is why you don't see them on everyone's lathe.
