Has any one used any of the handheld edger's? I tried the stihl edger with the curved shaft today and was very impressed. Although I think the strait shaft has more power and won't vibrate as much as the curved shaft model. I am seriously considering the purchase of one of these units. Does anyone have any recommendations? I'm thinking I should even buy the one that has the quick change, you can purchase lots of different attachments. Do you think this quick change will be the same quality and performance as the edger only models? Would love to hear some of your opinions, Bring it on.