I purchased this combo kit in June 2005. It arrived in July. I used it 3 times and found it incapable of maintaining sufficient air pressure to drive the nails properly. I needed to use a hammer to drive the nail in all the way. In September, I took it to the nearest Hitachi authorized service center (Amazon doesn't take returns) and they told me the nail gun was fine BUT the compressor had a defective regulator. The regulators were on back order. In December I called Hitachi USA in Norcross, Georgia and... more info