At a higher level it seems to work OK, but it does not collect all leaves from the ground. If you lower it, there is not enough wieght to the machine to keep the drive wheel from locking up and dragging. If you add weight to it it works just fine, but I can't imagine telling someone to buy a brand new machine and add concrete blocks to it just so you can use it.
The locking washer mechanism on the height adjustment quickly wears out and allows the brushes to raise up - ergo picks up nothing since you are brushing air. I have tightened the adjustment and it keeps slipping. I have to get off the mower and reset it - good for abou 3-5 minutes before I have to stop and start again. Sears needs a better mechnism to lock-in the height - I see that on other models but not this one - a $300 investment in this product. I will be trucking down to the Home Depot to see what other locking mechanism I can use to lock the washers in place.
works great with added weight ... for the price its worth being a little creative, its amazing what adding a few bench weights to it, will fix all its problems... maybe a future model will come equipt with a weight system.