I've had this GDX-1800 for a few years now and it typically travels with me in the vehicle and has handled every task I've put her up to, including moderate repairs on my vehicle and others, drilling/driving fasteners, etc. Admittedly I have not tried using her for heavy tasks; I understand and respect the limitations of this tool and have my expectations set accordingly. I'm a huge fan of the engineering behind this tool, it is an average driver and average impact wrench but combined is a neat idea. I owned a GDX-1600 before and the 1800 is a big improvement; eventually I'm sure newer versions will be better, with a better chuck and better anvil, and a stronger motor/hammer for a higher torque output. The overall design is light and maneuverable in confined spaces, great for working under the hood or in cramped work spaces. Improvements that could be had: Stronger motor/hammer A more robust chuck design, current chuck is not very secure, barely enough to hold onto most standard sized bits. Adjustable speed settings not exclusive to trigger pressure, or perhaps different modes (driver mode/breakaway mode, etc) A better light, multi-bulb ring around the collet is growing in popularity for goos reason. Overall a good investment, highly recommend.

Smooth running tools and extremely strong

The bit is stuck. The whole chuck is not working .

To retain 1/4" hex bits the red ring beside the 1/2" drive needs to be pulled out while inserting a 1/4" hex bit. It's a locking mechanism. The hex bit needs to have a groove to work with this mechanism. Once you figure it out it's very simple.