I have the Incra 16in router fence. At the time I was impressed by the box joints and dovetail joint being made in the demo at the woodwork show.
I have tried making box joints. You need a sacrificial fence to avoid tearout.
I have not tried making dovetails.
I love this fence. I use my router table a lot. For edge profiles or grooves, I rarely use more than a few inches of the available depth.
You will soon love being able to quickly set a depth, and easily repeat a depth.
I added thick MDF sacrificial split fence in front of the aluminium. Two pieces of 3/4in MDF glued together.
Held in place by some UHMW pieces which go into one of the slots and screwed in from the front. You can see the two screw either side of the router bit in this picture.
You can also see the right hand side has seen action as "sacrificial". This is why I used MDF. Cheap to make, flat and cheap to replace.