I have the 64 gb 3G and love it....except for a problem with email retrieval and sending. I have three accounts set-up (one Exchange and two IMAP). Long story short - even tough "push" is enabled on the Exchange account, the iPad goes vast periods of time (up to an hour or more) without updating received/sent mail. Even clicking the refresh does not pull mail in the inbox - even when there are new messages. This occurs both with tiny, text-only messages and big ones Similarly, when I send something, it will often sit in my outbox for a long time (as much as 30 minutes or more) without sending. Again, it happens both with and without attachments. This happens for all accounts on my iPad. Turning the iPad off and on solves it (switching between 3G and wifi does not solve it) but I shouldn't have to do this. I have also deleted and recreated all of the accounts but that solves it only very temporarily.
Help!!! I love this thing but am getting annoyed.