Hi there Trendie
I did look into this some years ago, and the technology seems legit in that it can change states - but then I came to the conclusion do I want to be trading in an altered state, probably not. There some expensive systems out there, but one I found was some software called Brain Sound Studio that allowed you to tweak the levels and adjust the waves to suit what you wanted which was pretty cool. It also allowed you to add the beats to whatever other music you like, as its in the background which gave some interesting effects especially with electronic music.
In terms of using it, probably useful to get you into a focused state but not to use while trading. Meditation practice is probably more useful in the long run. But theres plenty of apps around for free thesedays for binaural beats.