These can be quite handy given the right circumstances. If you need to move something heavy across a smooth solid surface these can help make a multi-person job into one. The little lifter they supply does come in handy as long as you can slide it under the edge of the item and that edge is strong enough to support the weight. The downside is that just the slightest bump can impact the small wheels and the item can slide right off one or more dollys. What is needed is something that has more grip than what is provided to keep the item from sliding off at the slightest bump. Because of how small the wheels are and how easily items slide off of the dollys, they will not work on soft surfaces which is too bad. If they had a means of being secured to the item, it would really make these useful, especially if you just want to move items across a room and not have to get help.