I don't keep on top of the Stihl lineup as much as I do with Echo....so how does this compare to the 550 or 600 Magnum? I'm assuming it has less power (just based on the model number), and they are marketing it based on the electric start, not the power. Do you think E.S. will come standard on the other pro models soon? Just curious, not like I'm going to return my Echo.