We found that entirely useless. It was recommended to us by someone who has no kids. As the parent, you most likely know what they want anyway.
We have other friends with similar aged kids who's kids get incredibly frustrated when they cannot communicate something like that and just scream until the parents five then what they want.
Our kids did use it both differently, and different amounts, but it was a minor helpful extra for us.
I find it rather strange to impose a defined vocabulary on them. If such a toddler language would actually be of any use to solve an actual problem, I think evolution would have already found a (then well known) solution.