We have had them in Australia for a couple of years now. The impressive thing is using the conturo with the vacuum clamp because the clamp can rotate and the conturo actually propels the piece. Great for round table tops. When I have used them they even suck onto particle board.
Would I buy one? Probably not because I don't have a use for it. If I was making multiple table tops square or round then yes. They have an amazing grip! Even the compressor is in a dedicated systainer. http://www.festool.com.au/epages/tooltechnic.sf/en_AU/?ObjectID=358458
Be prepared. Ducting is expensive and the costs goes up considerably the larger diameter you go. Even pvc will be expensive. For example a 20ft long 8" pipe will cost over $100. Until you're ready I'd get a portable system and a good respirator.