I’ve done one. Lots of people here did them. We all (yes, all – 50ish people) thought they were useful for making us think about our own personalities (and resultant likely strengths/weaknesses) and how to deal with other people and/or get the best from them based on their personality types. Lots of positive responses back from those being managed after this work. This coming after a largely sceptical group on the subject before we did it.
If you’re narrow-minded and want to write it off as psychobabble, ultimately that’s your loss. To me it sounds like just the sort of thing you’re always moaning about UK business having a them/us management/workers relationship – this is one of many things that helps break that down.
Sorry, no studies that I’m going to google for though I’m sure they’re out there. It’s good because in a sense it’s common sense but it summarises it in a way that allows you to make better decisions because you think things through more logically than through gut instinct alone.