I've used a friends electric one from HF and I own the air powered one. The air model is far more powerful but it's also louder. The air model also won't burn out if you use it too long. Electric tools are handy but they are not designed for continuous duty like air tools are. Nothing gets at me more than having free time and a project I want to do and having to wait for a tool to cool down so I can continue using it. Yes the electric one could be used outside your garage but if I break something so bad that I need this, it's probably not fixable at a ride spot. If you have a good air compressor, use it!