I have yet to play with rehydrating them, since we've had an abundance of fresh ones available recently. As far as I'm concerned, fresh is always going to be best with any produce item. So, I've been making the most of the strawberry season while it is here.
As far as the dehydrating goes, wash the berries and remove the tops. Don't throw them away! Freeze the tops and toss them into your smoothies, I swear that you won't taste anything but strawberries.