I know folks who have the 1" pavers over concrete that are 6 or 7 years old without any issues with cracking or shifting. You need to seal every few years, and occasionally sweep some sand in the cracks but you have to seal painted/stained drives as well. If they are installed correctly, they will cut your concrete at the edge of the drive and install a few rows of full size pavers (that's where the tires exert the most force entering the drive). After that, the pavers are petty well locked in.
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