edger for 45 degree curbs needed

I am looking for info as to a brand/model of an edger (gas or electric) that is designed to give a nice, vertical cut along the backside of 45 degree curbs. There's several that "sort of" work. But, I'm hoping to find one that is really designed for this application.
I use a powerful electric Craftsman. It works OK. But, only with some muscle and close attention while edging to keep it going the way it should be. The muscle goes into keeping the blade pretty much vertical. I'm actually holding up the outboard side while the inboard wheels and blade run along the curb edge.
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The man that does our lawn puts the edger on the grass rather than the concrete
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