I've not used it,
...but that is mainly because I've yet to generate a PC whom I would felt had grown up as a 'prodigy'.
Personally I would use this feat the same way I would use any feat that refers to the character being special inhis early life, or a paragon of rapid advancement.
IE: The kid who graduates highschool at 13, finishes his first degree in college at 17, and has a Ph.D. in his mid-twenties.
I can see why a lot of people complain about a lot of feats, but I don't think it's as much the fault of the feat as it is of the players who abuse said items.
Then again, I'm an unusual one in that I design a character who makes sense, so the only time I grab certain feats is when it makes sense to the character's history and development.
In my current FR campaign I'm playing a Paladin of Lathander and he recently earned a feat, now I could have grabbed anything that would increase his potency in the game, but the only think which made sense was 'Spirited Charge' - you see he fights from the back of his mount, a Dire Wolf, quite often and he has used the lance a lot.
Even a bit more queer was the fact that I dicussed the feat choices with not only my DM, but some of the others in the group as I wanted to make sure I picked something that would 'fit' to the current events and gaming.
Anyhow, I think as long as someone picks a feat that 'fits' to the concept, history, design and so forth of a PC, it should be 'all good all the time'.