I took a look at the Milescraft baseplate and I had a few thoughts:
1) It seems to be a better fit for bases that are round, the DW621 is more rectangular.
2) I really like the dust collection feature built into the DW621. I am afraid that I would lose that ability with the Milescraft plate.
3) I am already tooled up with bushings and mortise jigs for the DW621 and I am do not want to retool and respend if I don't have to.
4) And finally, I was hoping to hear from some one who has a DW621 that could possibly shed some light on why the shaft is not centered in the machined base of the rougter. Initially I felt that it was a good design because there was no adjusability in the bushing ring. Who better to align the shaft than the manufacturer? So, I can't help wondering if I am missing something.
Anyway thank you for the replies.