I think I have shown this product before, but figured I would again....
http://www.redi-rock.com/
In case you haven't heard of it, I would look into it. Over the past year, a local excavator has starting installing these walls.............and well, they are taking over!
I've heard of 4-5 jobs that were initially spec'ed out for versa-lok that were changed to the redi-rock.
I'm thinking about jumping on the band wagon. When it comes to structural wall systems, this redi-rock really has its act together........something like 15ft tall and NO GRID required.........that's huge.
Maybe the the wave of the future???? Who knows, but there are a LOT of these things going up in my area..........
steve