I use the DRO on my router table height all the time but never for absolute measurement. I fire the thing up for relative measurement when I want to tweak the height a bit for something like a half lap or adjusting the bit for rail and stile work. For that, it works great and I wouldn't want to live without it.
So I'm considering a table saw fence DRO for similar tweaking but I wonder if I would use it for absolute measurement. I change blades fairly often. I didn't use to until I got the Sawstop with those spiffy flats on the arbor. Now I don't have to wrestle the blade.
Any and all advice would be appreciated. FWIW, I have the Sawstop ICS (I love my wife).