As it's not really an honest to God review you want, it might better off placed in Support & Tips. However I'm sure the mods will move it if it's wrong
In answer to the original question...
I have a Brainwave deck, and I think it's fantastic. I normally take it out with me.
You can use it for a million and one things...
Well. Maybe not
that many, but a fair few.
I've opened a set with it before "If I told you to pick any card from a deck, which one do you think you'd pick?" then they name and it and you tell them that you'd want them to put it back in face up. Spread through and show their card IS the only one face up
You can use it as mentalism, as an out if a trick goes wrong, or you can do the whole "I'm handing you an ID. Take it out of the box, shuffle it, look through and find one card" blah blah blah.
There's hardly anything to remember, and generally they handle very smoothly
All in all... a worthwhile purchase

You wont find much better anywhere and it's nothing - a rigmarole with a few bits of paper and lots of spiel. That is Mentalism
Tony Corinda