Paul J. Miller has written a real review of Infoqube. It's the first one I have read, and it is well worth reading.
Did it make me want to go out and try the program? No, and that even though I liked Ecco (which it tried to emulate and expand on). The reason is that I have come to believe that outlines are not the best way to store long-term information, and that I therefore like better a hypertextual approach (say wiki).
But I admit that not everyone will feel that way and that there are some that will brave the steep learning curve of InfoQube. I am too old for it.