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I think JP and HR are in part suggesting that your base prep extend such that you aren't driving spikes into sand at all - it's going into your aggregate base, which should hold the spikes fine. Get spiral spikes for some added bite, and remember to pound each one in a t a different angle for even more holding power.
I was raised near the Detroit area, so I'm familiar with the concrete edge as a paver restraint. Problem with that stuff is, it's only 3" or so thick, and 3-4" wide - no bead of concrete, no matter the ingredients or how well it was installed, is going to hold together in a 20, 30 or 40 foot ribbon. It's going to crack every 18-24" (or more often - I've measured it) - sometimes the pavers will stay attached to the concrete as it migrates away from the rest of the pavers, sometimes not. But it does crack, and it does move. Years ago I tried to improve on the method by pounding in rebar along the edge prior to installing the concrete - it was only a minimal improvement.
As a side note - whatever edging you might choose to try, use one that attached one to the next - we use aluminum edge restraints from Sure-Loc and Curv-Rite, and they both allow you to make one continuous strand of edging, further helping to hold everything in place.
Hope that helps.
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