I've used those, and I've also used the sweeper type pulled behind a garden tractor. They work just fine if the underlying grass was cut before the first frost and the leaves start falling. If the grass is too long underneath the leaves they do not pick up as well.
After the push or tow sweeper is full you have to back up, and drop it where ever. Then they have to be gathered and loaded. I mean this will work, but as another poster said, if you can get the bagger for your mower it will hold more leaves and make it more convenient to remove from the property.