Well, I aerated five lawns today. This was my first time at this so I thought I would pass on some observations for any of you that have not done this yet so for the more experienced, this might be a re-hash. Some background Machine is a rental, Ryan. ($74.00 w/insurance) It is a walk behind and I think it's a 21" Lawn sizes: #1. 30,000 sq/ft #2. 20,000 sq/ft #3. 25,000 sq/ft #4. 9000 sq/ft #5. 9000 sq/ft I picked up the unit at 0900 and got to my first lawn at about 0920. The guy at the rental shop didn't exactly check me out on the machine but it only took me out about two minutes to pretty much figure out where everything is and what lever does what etc. For those of you that do this for the first time, you may may want to ask questions before getting the machine into the field...especially if your solo. The first lawn I did was the biggest. You really get a sense of how big a lawn is when you walk behind something over it. I normally mow this lawn with a Z-steer so when I aerated it...boy did it seem to take forever to do this lawn. Finish time...1.5hrs! Granted, about half that lawn was me getting used to the machine and trying to figure out what line to use that would be the most effiecant. Contrary to the way I mow, I found that aerating in a circular pattern seemed faster because turning one of these beast at the end of a row ain't like tossing a walk behind mower around. Cores were nice and consistent but i noticed that the machine works better if you lean on it a little. The problem with this (with this machine anyway) was that since I am 6' 1", that meant constantly bending at the small of my back which in a word...sucks. So, I simply went 80% of the time, letting the weight of the machine do the work. This seemed to produce pretty decent results. The rest of the lawns were easier to do, but trust me when I tell you, for a 46 year old guy who is admittedly overweight, here are some thoughts at the end of the day.... -My feet hurt -Next year...charge more! -My feet hurt -My feet hurt -Oh, did I forget to tell you I made $500.00? -My feet hurt -My feet hurt.