I have less than a 1/3 acre lot, so I figured this should be adequate since the box says for up to 1/2 acre.  The goods:  well built, string feed seems to work well.  No need for power cord, gas.  No battery memory (claimed)  Quiet, no exhaust.  The bad:  I'm 6 feet tall and find the handling real ackward.  The battery last less than 15 min on a full charge.  I do light trimming and edging and I find that I can only do 1/3 of my 9000 square feet lawn with each charge.  A two hour recharge bought me another 5-7 minutes.  The narrow 12" cutting path exacerbates the problem since sometimes I have to make 2 passes to finish the job.  There is not enough power to cut tall (6" or more) grass.  I returned mine and bought a gas powered, which I'm much happier with.  If you live in an arid area where grass never gets real tall, and your lot is very small, this may be perfect.  The reason for 1 star is that it is not appropriate for lot size anywhere near 1/2 acre as stated right on the box.