My 21" Excalibur is probably the best money I've ever spent on a woodworking tool. I can put a $1 coin (Canadian Loonie) on the table, put the speed up to full and the coin remains standing on edge. It may shake a bit, but not much. I started with a single speed 16" Ryobi, moved to a 18" Dremel and then my Excalibur. Much the same as JulieF.
Mike