I use one when I am working mobile. The noise they make is not too bad. Kind of higher frequency, but you can have a conversation over it. Tremendous power on both ends. If you get one, be sure to order an extra set of two of the filter bags.
If you decide to buy, I just ordered one, Amazon has by far the lowest price for the 4hp with the dolly, 6'hose, two 20" extensions and 13 attachments. $159.99 + free shipping. It's the first one listed if you search metro vac n blo; have to add to cart to see the $159.
