I use my coaxx indicator a lot and I'm always lowering the knee to use it, then coming back up so I can keep the quill retracted as far as possible for rigidity. So I think it would be a time saver for me.
I did find a thread here about the same DRO with someone asking about it, but there was no follow up on whether he bought it or not. I did post to that thread asking if he did get it, but no response yet. I did see someone asking that if he did get it do a write up about the install. I just may do that if I end up going with that unit.
I also found the eBay vendors web page and buying it directly from him saves $20, and that just means I can buy more stuff for the mill