I have one and find it to be very useful. I use it mostly for woodworking but started using it on my truck body panels. It is great for the small corners and odd places you cannot get into with other tools. The hook and loop sandpaper allows you to rotate the paper if you are mainly using just one corner and it last pretty well if you are only doing small areas like I described. There are some other attachments I have also found useful for other chores. It seemed expensive but the Fein stuff always is and it is always very good quality.
Chuck
