I've had the Incra for a couple of years and really like it on my Delta Unisaw. It has an important 2nd piece that fits to the right of the blade that keeps cut pieces from flying off if the blade catches the loose piece. It effectively acts as a zero clearance insert for your cut. (Edit - you can buy something similar for the Rockler sled for about $35).
I like Incra stuff, and have their router fence as well - though, honestly, I've never mastered the whole Incra joint stuff. It's really accurate and does a nice job. I like the Incra stops that can be put on the telescoping miter fence. Since I have several, I can mount them simultaneously on the fence for different cuts (assuming there's enough difference in the cut sizes). The angles are accurate, too.
The picture on the Rockler site is actually reversed (you can see the word Incra is backwards in the zoom-in).
Do you have any specific questions about it? I leave it on my Delta all the time - it's the only miter gauge I use anymore.
Last edited by LDBecker; 07-18-2016 at 05:55 PM.
Reason: Extra info on Rockler sled