I got one of these off a Woot the other month. It performed as advertised on the vast amount of dry crap on one side of my house. It tossed all the (slightly damp) leaves and twigs out quite nicely. Yes, I still had to get up on the ladder once to put it up there, but I didn't have to climb down, move the ladder three feet, climb back up, rinse and repeat -- the looj probably saved me a good hour.
Unfortunately, the other side of the house was worse with the gutters containing standing water and a kind of vegetable soup. The looj didn't have any problem being submerged, but it was pretty much ineffectual. It simply showered me with foul-smelling water and pushed the mush ahead of it until it got stuck. I ended up doing that side by hand.
So if you use the looj a couple times a year and on non-flooded gutters, I think it's a good little tool. It keeps me off the roof, and that's easily worth a C-note to me.