I'm curious if there are any downsides to using a central vacuum dedicated to the shop over the usual shop vac? Centrals would appear to have greater suction, in both flow and water lift and have provision for exterior exhausts and mufflers. They also come in 110V and 220V flavours with more power from the 220V units. Admittedly more money but not by much when compared to a Festool. Some come with HEPA filtration and some in both wet and dry configurations. Are any of you using one in your shop?