I used it for a while. It is incredibly annoying for people on slow connections as it is full of flash advertising, as you will have seen on the bottom of your email.
But it is a fun product, with lots of snazzy backgrounds and smileys and so on.
It is fine if you are young (or young at heart) and not using it for serious emails - just fun stuff between friends.
I now used GMail (google mail) for all my email - it is web based so can be accessed from any pc in the world and now has a mailbox facility so it can retrieve emails from other email addresses, like OE. The easiest one I have ever used by far.
Thunderbird is highly thought of as an OE alternative:
http://www.mozilla.com/en-US/thunderbird/