I always say "good at doing something". Now I just came across this sentence, by a (usually competent) native speaker of American English, where she says "good about doing something". I'm not sure I've seen or heard this construction before. Is it correct? Is it common? Is it a specifically AE thing? Or a regional thing?
"Susan is really good about checking in often and keeping up with that."
"Susan is really good about checking in often and keeping up with that."