LawnBott LB300EL Robotic Mower
The big brother to the LawnBott Spyder is this LawnBott LB300EL Robotic Mower which uses a perimeter wire and will cut up to 2 acres on a charge. Run time is as long as 10 hours to get the job done, and the 4 sided blade makes short shrift of even longer grass. This mower is Bluetooth capable, and you can get a smartphone app for to remotely program it at your convenience.
The LawnBott LB300EL features 3 different sensors, a magnetometer, a gyroscope and accelerometer, to keep it running straight and true, especially on hilly terrain. It weighs about 45 pounds, and would be a good choice for larger suburban lawns or lawns that are uneven.