I have the Black and Decker equivalent, must be 10 years old and is still going strong, despite a lot of use - ported 3 cylinder heads with it and motor got so hot I could not hold it yet till it carries on. Only had to replace the chuck spring in all that time.
Very useful kit for cutting slots in sheard bolts, removing bolt heads, cutting cable outers etc etc.
The tools come in three different diameter shafts and as you may have guessed, there is a different collect for each diameter of shaft.