I could not believe that the PC teck said that plunge routers all have play in the shaft. The right side has such play that you can tilt the router base by applying pressure to one side even when locked and he said this is normal! I have a RE600 Ryobi that is solid in all positions.  I tested the DeWalt621 and with one post it was solid.  The depth adjustment is also very hard to set, you have to turn it many revolutions to get it to adjust. The dust shield falls off easily. I returned it after one day.