The new Festool new ETS EC 150 is really very clever - it won't work without the dust extraction on, is long lasting and protects users from excessive vibrations.
There's also a clever APP which can tell you how long the sander has been used each day and how much energy it consumed.
Festool had a huge stand in its homeland at Automechanika Frankfurt 2014 where stand staff demonstrated new equipment. Thanks to Blair Brydon from Tooltechnic Systems for co-sponsoring my trip over there. I have listened to this over and over, as I love the way this guy says 'vibrations'.