IMHO they look a mess and they make a mess. I have two neighbours very close by who have them. The pebbles are always all over the pavement and go quite far in all directions. As someone with mobility issues they are uncomfortable to walk on and they must be a nuisance for wheelchair users and those using pushchairs. I can imagine them being uncomfortable to walk on every time they walk to or from their car and slippery in the rain or icy weather. Can those who chose them please explain why you wanted such an unpleasant surface on your driveway? Again IMHO and only in my opinion. Yes I know everyone is different but...I don't understand the choice.