I bought these LandRollers about a month ago, since my wife and I walked our 3 dogs about 1.5 hours a day and they were still full of energy. The LRs have truly been a marriage saver, for reducing stress while rolling around in the morning and in the evening hours. My dogs are super tired now when we get back to the house. I love everything about the skates, easy to strap into, stable on the road. They do roll across grass to an extent, my dogs periodically chase bunnies in to the grass and I roll right over with ease. I find them very comfortable, I chose a size 10 since that's the max size shoes I've every put on my feet and they fit. Only downside to these skates is the wheels are pretty expensive and only can be bought through their website. So $61 for new wheels was a bit pricey, especially after i just pick up the skates for $250+ earlier part of September 07. If they worked on using a higher grade wheel (ie 87-90A hardness), I'd be a lot happier customer because that is the only downside I see to these blades. That's my $0.02.