I dunno...I think Gmail sucks honestly. I have used Yahoo mail since 99 and had no problems. The new Yahoo mail beta kicks the s**t outta any online mail app out there. As PC World put it "Google gets more attention, but Yahoo gets more done".
There is no way anyone can upload/send 1GB of mail a day. Even though there is unlimited storage, there is still a restriction on attachment size. That being said, I also believe that this is just a marketing ploy as maybe .05% of their customers would ever use more than the already allotted 2GB.