I dig it too.  It is played much like a shaker but it does not replace my other triangles.  It has a bright light sound.  It adds nice options for a multi percussion attack all at once.  It would be nice if there would be additional sizes in the future.
Perhaps someone could customize other triangles using this idea.
I would like to know what those samba players think of this.  They are the triangle masters! 
 I agree this looks like fun and I do enjoy mine.  I am glad that I am not the only one who plays percussion in the car (this, shaker and tamborim) while on the road.  My wife thinks I'm a nut because of this.  (She's right, so what)
Keep it fun.