Used the Neiko Angle Die Grinder on and off for a few weeks and the had trouble with the head loosening upcausing it to swivel out of alignment. Since I have a smallish 5.2 scfm at 90PSI compressor I could only operatethis tool for a minute or two which was what I expected. After 6 weeks of light use it totally fell apart. You get what you pay for!