I use a push-style lawn-vac machine to clean out the leaves (and also remove grass clippings after I have mowed the lawn).
Because it cuts the leaves in relatively small pieces before putting the leaves into the bag, it can pack quite some leaves before the bag is full. After saying that, I still need to empty the bags at least 7 times whenever I remove one-week-worth of leaves left on my 1/4 acre property.
This machine is good if you like to compost tree leaves. The leaves that I left in my compost piles 1 week ago has cooked quite hot even in this cold weather -- I can see and feel white-hot stream coming out from the piles when I turn the compost piles.
On the other hand, if you are not into composting, you may not want to use this machine. You may be better off using a leaf blower. The lawn vac costs a lot more than a leaf blower. And I am under the impression that it doesn't vacuum cleaner than a leaf blower can blow either. And I am 100% sure that it doesn't vacuum grass clippings from my driveway better than a leaf blower can blow away the grass clippings. In my opinion, a lawn vac has similar functions as a leaf blower: Both can clean leaves and grass clippings. The differences are: (1) A leaf blower can clean grass clippings from your driveway better. (2) A lawn vac can cut leaves into small pieces. Therefore, if cutting leaves into small pieces is not something that you need, you may be better off using a leaf blower.
If you have decided to get a lawn vac, you may want to get one with high suction and self-propelled unit.
- My lawn vac is something like a 4.5-hp. It is OK with sucking leaves and winged seeds from a hard surface. But it always leaves winged seeds behind if it is on a grassy surface. I am hoping that a high suction unit will get everything. (Correct me if I am wrong if someone has first hand experience with using a high horse power lawn vac).
- A lawn vac with one large bag of mulched leaves can be quite heavy (I know that because the one that I have is NOT self-propelled). Therefore, a self-propelled unit is a good idea.
- The suction head of my lawn vac has one problem: It can easily dig into the lawn and damage the lawn if I lower the lawn vac close to the ground. If I don't get it close to the ground, its suction power will be reduced. It is a catch-22 situation. This problem could have easily avoided if the suction head is flexible and has a wheel in front of it; then I can lower the suction head close to the ground while the head will also has enough clearance from the ground. I don't know if there is such a lawn vac available in the market. You may want to look for one that has this feature.
Hope this helps.
Jay Chan