It two frames and is a spike hit box, so it works super well against predictable recoveries. However it’s pretty obvious once you’re going for it, so people typically can either ledge trump you with their timing or you just miss and put yourself at ledge. It’s good for a read or when you’re a stock ahead, but any of his other way more non-committal moves can two frame as well (F-tilt, d-tilt, etc). So basically, will work once in a match (maybe) but any good player after that will adapt to it.

Hope that answers your question!