For years I've struggled to maintain a neat edge between my patio and lawn, having tried every technique I could think of without success. This tool has completely solved the problem, creating an immaculate edge in very little time!
Insert the circular blade between paving and grass (using the footrest for extra pressure if required) until the sidewheel hits the paving. Then simply push the tool downwards and forwards and the blade cuts neatly between paving and grass whilst the sidewheel runs along the hard surface. The circular blade is cleverly convex, automatically exerting a little sideways pressure against the paving to ensure a perfectly straight edge with no chance of straying off line.
Now let's get one thing clear, this device is specifically designed for edging lawns which join a hard surface such as a patio or path. It's definitely NOT intended for use on lawns with a soft edge such as a flower border. This is perhaps not abundantly clear from the advertising `'blurb'' but the clue is in the photo.