I am surprised to see that there are no reviews of this sander, as it is a great little tool.  I have been using this sander for about three years, and it has been put through some tough tests -- sanding up to 1/2" off  wood edges, sanding floors, sanding tough wood, and even sanding plaster  off the walls of a 250-square-foot room.  In every case, it has done a  terrific job, never weakens under pressure.  The sander has very little  vibration, and it leaves no swirl marks, even when using lower grit  sandpaper.  Several times, I have dropped the sander onto the cement floor  of my shop, and still it keeps on working.  The only minus I can see with  this sander is that the dust collection system could be better.  Even  though it has a dust-collection bag (which gets filled up, suggesting it is  catching a lot of dust) you need to wear a mask when you use it so you  don't breath in harmful particles.  It is even pretty good at getting into  tight corners, better than other sanders.