I've got a reasonable sized patio that requires weed killer spraying on it at least twice a year. I've previously used weed killers that come with a sprayer but have found them to be a bit of a pain in the back and require lots of pumping.
This sprayer, fully loaded, is easy to carry around (with the integrated strap) and once pumped will spray a large area. I'm not restricted to buying expensive weed killers with sprayers and can quickly and comfortably spray the patio.
The unit is well made and easy to clean and is a welcome addition to my garden tools.