I thought it would be more difficult than on a paved surface - but I found it to be quite a bit easier. I used an old pair of running shoes. Early morning run in heavyish fog -- just a few cattle and kangaroos around as the sun started to rise higher into the sky. AND I did it non-stop!!. I seem to have conquered that aspect of my 5K career at least - although I still can run faster using run/walk.
I will do my second 10K run/walk this Tuesday in Sydney -- I am really starting to actually enjoy all this