I like openness and discussion about such attainments. Maybe not in a way that breaks the Buddha's precepts. As Ajahn Brahm said, you can actually know of someone's attainments by asking a fellow monks who knows him well or is a close acquintance of that other monk. Because monks can reveal attainments to other monks but not to lay persons.
Unfortunately none of those who are claimed to be arahants have so far convinced me that they are (nor am I convinced that there is any living master that is an arahant - whether he/she has proclaimed it). Perhaps the clearest in terms of insight is Daniel M. Ingram, but even him (who self proclaims himself to be an arahant) I do not consider an arahant in the traditional Buddha's definition of it.