That is probably one of the nicest walkers around, its not over restored and shinny like a collector car. If you figure the HP to weight ratio at its actual weight as pictured, it is equal to the M1 Abrams at combat weight. Abrams comes to 21.43 HP per ton (1500 HP at 70 tons) and that walker at 500 HP and 22 tons is 22.73 HP per ton, plus with a top speed of 45 she'll pass anything but a fuel depot.
Now, you just need a Centurion to go with that!