Not completely useless
This tray doesn't fit to leave enough room for hands to grip the walker very well. I had bought this for my mom for her in home OT and recovery, after having surgery for a broken femur.  For the first few weeks she couldn't use it because she had to use her hands for weight bearing, and the tray got in the way. It also isn't very stable. However, it did come in handy to use on her lap for when she ate. We thought maybe she could just use it as a side table on top of her walker, but the tray was too high for it to be useful in that way. Now that she can bear all of her weight on both legs, she may get some use out of it while using her walker, but at this point, she will be transitioning to a cane. So, in summation, it's great as a lap tray, but it does not fit a standard walker.
Rating: 3 stars