Posted: 25/02/2014 at 20:00
I haven't used it myself as my garden is quite free draining, but I have installed it in a friends garden.
I used it, and put gravel chips in it, brush them in them tamping them down to give a very pleasing gravel path which doesn't hold water.
This is the main idea behind them, and I've seen them used on some gardening programmes for the same purpose. It does contain the gravel within the cells, and you must remember to lay a membrane underneath.
I would be concerned if you sowed grass seed as a filler for the cells, as they would be prone to drying out in my opinion.
You could seed the gravel with some herbs to give it a lift if you wanted to break up the path profile.