I have the SqueegeeMate, Backflip in two sizes and a Wagtail Combi. All are good at different things. If the window is fairly clean, say 2 weekly, they will work well but for fairly dirty windows you have to go over again and eyeball a lot so I find normal methods quicker. But where you can use them they really fly!
Try a SqueegeeMate with a Pulex Swivel handle and an aluminium channel, this set up at 14" is pretty light, about the weight of a brass handle and channel.