DJH, Mousethief and gnu have mentioned some but the benefits of membership can be found in this part of the FAQ. The comment about Hearme is redundant.

pattyClink, I think there are times when a number of us do feel the need to re-enforce or voice support to a comment and I don't think that is being rude. The problem is of course that if everyone who thought "me-too" posted just that we would have an awful lot of extraneous posts. I think, in general, it is a habit best avoided.

Jon