Works perfect with the DW744.
My DW744 manual says to replace the outside washer with the inside washer and use the arbor nut only. Another reviewer had a problem fitting a full size dado with both washers. Check your DW744 book. Dewalt may have changed there manual, so a call to Dewalt will get you a new manual.
The insert fits fine but the accompaning instructions point out a minor problem not addressed with the original DW744 instructions: You cannot put a full 13/16" dado stack on the arbor and still use the large outside washer which acts as somewhat of a blade stabilizer. You might get a 3/4" stack on using the washer and lock nut, but to use the extra chipper(s) you'll have to secure it with only the lock nut (or an aftermarket thinner washer/stabilizer). Probably not a big deal but DW could have easily solved the problem with a little more thought in their engineering process regarding the arbor length.
I feel that this really makes the saw complet. i don't see the need with haveing this attachment that you need to have a full size table saw. The Dewalt team have out done them selves with this and the whole saw it self.