Mighty Mac yard vacuum with 2 3/8 chipper. Works wonders on a gravel drive.
Engine starts easily first time but has always been tempramental about re-starting when hot. That doesn't matter as one bag full is a lot of leaves! The chipper works on very substantial branches. I've used a wooden pusher with it.
The vac is self propelled with three forward and one reverse speed. The height of the vac nozzle can be varied to cope with different surfaces.