Mike, love the router, what a great machine, particularly in the table with the FX lift, but the base plate is proprietary. This is like all the phone companies having different batteries and charger connectors--annoying that they took so long to pick a standard. The PC size opening is pretty much the standard for guides. and it is necessary for mounting the special guide for the DadoWiz. If the base plate that comes with the 1617 came with the PC size opening, it would be perfect, at least to me. All the after market PC size base plates are much larger than are convenient for the DadoWiz. For free hand routing, I prefer the smaller factory size plate. Finally, having to have an adapter for the adapter is just a little over the top. To get the setup I really want, I guess I'll have to cut down one of large aftermarket plates, although they have so many holes in them I'm not sure I can do that. Why doesn't Bosch just make a accessory plate with the PC size opening?