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To have a snaking bed edge that is guaranteed not to crack, I believe you'll need a footer to go below the frost line, at least in some parts. I can't believe they'd bite on the cost for that.
The picture they saw was most likely taken within minutes of completing the job - I'd ask for the address and take a spin by for current photos. My bet is it's cracked and heaved all over the place.
One other option might be to make a shallow pour and make relief cuts every 2-3', then make sure that when you mortar the stone on you leave a small gap where the relief cuts are, anticipating the heaving (I know Agla knows the name of a good caulk-like material to use at the seams to give a mortar-like appearance). Then when it moves it'll do so in sections, just like a poured sidewalk.
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