My laptop email client is pull and I am happy with the way it is. I guess I do not miss something I never had a need for. email is not like IM, it can wait for 5 minutes.
Gmail servers can do push (right?), so if Yahoo mail on the iPhone is using Push, than why isn't Gmail? Not a big deal, I have my mail to check every hour (isn't that important to me). I am just curious why Yahoo would be using Push and not Gmail.
You don't need to upgrade your account to get yahoo push. That being said, even with your normal yahoo account yahoo push doesn't really work in its current state. emails arrive between two seconds and two days just depends on the wind I guess.