I'v been on it for a while now. It is ok (Yes, I'm an "ok" vote).
No IMAP still, so kinda worthless for me, except for services that it does good to have a yahoo account (IM).
Also, don't you get a KICK at how Yahoo and MS never show the HUGE ads they include in the webmail?
They know that would turn people off if they advertised it with a huge banner going down the side....