I like these types of comments as well, but I also find that lots of programmers tend lie in these comments. The comment may have been accurate at one point, but a small API change altered the behaviour of the function, yet the comment was never updated. I have seen this is my code (*blush*) as well as in others, and it can really throw you off.

Here is a maxim that I usually go by: The farther away a comment is from the code it tries to explain the less reliable it is.