I bought this after finding out that the SIP wrench I had did not have replaceable bushes, and they were worn out after 14 months. This rendered the wrench scrap. I checked out other wrenches available but none were rebuildable (including the Snapon ones others in my workshop use). I had to bring it in from the US, and use it with a 12v charger (which suits me as I'm a mobile mechanic). This wrench has worked tirelessly for 2 years and given no problems I've had one battery die last week, but was happy to buy another. This tool has really done some work! The wrench has loads of grunt, on a fully charged battery it will undo anything our shop-air wrenches will.