I can't tell you if its works, I bought 7 spots and have not cycled since I've been in. I was told that it would come around, but still it has not. I asked if I needed to do something else and was told no just sit back and wait, but I should purchase some more spots like a couple a week. Glad I didn't, so I guess I can't really tell it has worked good at least for me so far.
I'm also still having a problem seeing what line its on so I can gauge when mine lines would cycle.