I haven't seen the digital fence readout, but I did recently purchase the Wixey Digital Angle Gauge. I feel like that was a good purchase. That gauge is easy to use and the measurements are repeatable. I have tried it with my table saw and with setting the table on my band saw. Is the readout worth $100? That is for you to say but from what I have seen so far, the Wixey is a good measuring device. Looks like there is a bit of setup / mounting involved with this readout. I would make sure it is adaptable to the saw that you have before you purchase.
Good luck,
Duane