I really like mine, but I bought them at the mall instead of from the tool truck. I think that they were $20 each, and do well to store sets of tools that don't fit on Hansen trays. Think of impact wobblies, etc.
i have 1 row of my most used deep well 3/8 sockets on the twist loc rail. i dont know who makes them but you can get them at sears now, so you dont have to buy them off the truck