I have had several lawn sweepers over the years and the only one that lasted was the Parker. BUT, they are four or five times more expensive than other brands and I wouldn't have bought it if the insurance company hadn't paid for it after the other one burned in a fire.
RSKY
Parker was always the one. I've heard though that they were eaten and spit out. Really anything works except the real cheapos, but the heavier built ones w/ 4 brushes a side are better.