The first time I used it I thought it was faulty! I wasn't used to the way it was designed to respond to pressure. Apply too much pressure and it actually stops spinning. This is to prevent you stripping to much material. Once I realised why it was doing this I learnt to appreciate it more.

The dust bag has the DeWalt twist lock mechanism which keeps it securely in place, It is quite efficient at collecting a lot of the dust. This is okay for a few smaller jobs but when it comes to something bigger then you need a dust extractor. You do need anything fancy make use of the DeWalt DWV9000-XJ Universal Adaptor attached to my faithful Henry Vacuum Cleaner and love it.

I have used mine on wood, metal, painted walls and ceilings. The sanding discs are held on with Velcro, I tend to use an 80 or 120 grit paper which covers most applications for me.

Its worth noting that this is a random orbital sander, what this means is that as well as spinning in a circular motion the whole this is vibrating in a random pattern, this aids to prevent swirl marks and create a smoother finish.

The only slightly negative I can find is the the protected on/off switch can be a bit fiddly to operate. 

As always with DeWalt gear, remember to register for the extended warranty.