I mainly install water features but had a good friend ask to build a retainer wall for him. I have to say wow this was easy compared to stacking boulders. I've built alot of formal and informal ponds with dry stacked limestone or true 6" venner limestone. Having stones (blocks) that were all the same and flat made it so easy. After leveling the bottom run off it went. Yes I did check with manf. to make sure it would be installed correctly, geotextile, pins, 3'-4' gravel, drains and fabric. I hope to get more of these.