Brain training

Hey, i'm planning to try this thing called 'Brainflex' and was wondering if anyone know anything about this.


content from external source:

Brain Flex is an experimental (and free) composition of brain wave frequencies designed to perform the following:
If you are in a stuck, negative or unproductive state it can lead you someplace else.
If you are already feeling good, it can make you feel even better.
If you’d just like to exercise your mind, running it through a series of state changes by altering its external stimulation in unpredictable ways, it can do this too.
for further details chk dis link


Here's the link: www.grasshopper.com...

Has anyone tried this before? It seems it has some postive advantages. I'm just wondering if there's any negative side effects to this. Any advice on this brain training or others would be nice, thanks...