Ive always been using a varying depth of crushed stone, cr6 for all of our paver sub base installs. Topped with about an inch of sand for leveling purposes. There is a very successful company locally who I found out uses a #7 stone and thats it for a sub base. He still uses the sand to sweep in and lock the stones when everything is complete. Ive seen some of his work and it appears to be high quality. Not sure what the long term effects are though. Just wondering if there are many others using this method and how has it faired with you? Im going to install a walkway at my house in the next few weeks (if I can find the time) and I think Ill try it using the #7 stone and no sand. I hear it provides good drainage, and is easy to work with and level.