I used AJ concrete for a fairly big concrete project. He assured me that I would have no problems. He the driveway definitely won't crack and won't sink since he packs the dirt well. If it does he said he'll fix it no questions asked. I now have a cracked driveway and I've been calling him for the last 8 months to get this fixed. He keeps on putting me off and now doesn't answer my calls. The driveway is starting to sink in one corner to. Whatever you do I HIGHLY RECOMMEND THAT YOU DO NOT GO WITH AJ CONCRETE. Poor customer service and poor product!!!