Mine is not very effective on leaves. My experience is that you begin to pick some up but as they gather they begin to roll out from under the tines. I made a "ladder rack" out of angle iron that holds 4 cinder blocks and is bolted to the top of the tine frame. It helps immensely but it is hard on the lawn. Without added weight or down pressure you need a sweeping action or multiple rows of tines to really be effective.
That said, my rake is one of my most used implements. Particularly with the added weight of 2-4 cinder blocks, it is excellent for grooming gravel roads/driveways, dirt and when angled even does a remarkable job of plowing snow.....I know, doesn't sound like it would work because of the spaced tines but it will collect and windrow snow (or packed gravel or dirt) like no ones business.