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We did a paver driveway using Unilock's Turfstone. An interesting project, for certain. We prepped it like we would prep any other driveway, 12+ inches of 3/4- crushed stone, but unlike most of our paver installs we did install an inch of sand as a bedding course, but more importantly as a growing medium. Within each of the cells we swept a mix of grass seed, topsoil, sand and super-absorbant (brand names includes Soil Moist and TerraSorb).
It worked pretty well, but I think the drive could have performed better with more organic material in the bedding layer. Also, because the sizes of honeycomb holes was rouhgly 2"x2", the concrete on every side was a pretty serious heat sink. I wouldn't suggest this type of install in a situation where there's going to be lots of sunshine and heat all day. The turf will just cook.
For non-turf applications, install as you normally would, and over the top I believe it is recommended to use some sort of clear stone filler. Sand won't stay in place (and poly sand would defeat the purpose), so clear stone provide the best opportunity for water to drain through. Though if you'd like to use the 1" bedding course of sand, I don't see why that would impede water flow through the base. I believe ICPI specs sand in part for it's draining properties.
My $.02, anyway.
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