I just bought an Incra table, etc. along with the below table dust box. The dust collection from below the table works very well based on my short time of use and limited use of the table and fence so far. I bought the Wonder Fence with the dust collection port. Something to consider is that the in-fence dust collection only contributes significantly to dust collection when the router bit is buried in the fence. Once it moves outside the fence, which is true for joinery tasks on the table and some others, the under table dust collection is the primary source for collection. I set mine up with a branched 4" and 2"1/4" adapter to connect to my dust Oneida dust collector before I realized that. Mark at Incremental Tools suggested that, for joinery, removal of the Wonder Fence is a good thing to do and, with the under table box, dust collection is still very good. It's just a little more convenient to use just the Pro-Fence. Also, to get the best result from the under table box, you should buy the special table inserts Incra sells which are made with extra openings to create more airflow around the bit.
There are other under table "boxes" available that most likely would work also, General/Excalibur, Rockler (very reasonably priced), and possibly others. You can even make your own, I suppose, which would make it fit just your needs if there is a special application. I've seen videos online about making your own but you need to be careful to make sure that you allow the proper amount of airflow to make sure it actually draws the chips down.
I'd like to hear if a Festool vac would work as well (or maybe even better) than a cyclone dust collector from anyone who may have experience. It would be more convenient and less noisy to use my CT48 for that purpose.
