Another thing I read somewhere, sometime, the "dust extractors", like Fein and Festool are to run for long periods of time, where as, shop vacuums are made to run for much shorter periods. How true that is I do not know. I have had three shop vacuums in my 45+ plus years of wood working. They were not run for long periods but each one lasted many years...
Just another thought to throw into the game.
Kevin is correct an the Fein verses Festool. I bought the Fein, it was cheaper, after more study I realized to make the Fein equivalent to the Festool I would have to buy a HEPA filter. If you add the HEPA to the Fein, there are only a few dollars difference in price. I am thinking very seriously about adding the HEPA.