I FINALLY got my update about 2 days ago!
I have some lag issues when it comes to the web browser and basic usage (scrolling through homescreens, tapping icons, etc) but I'm planning on doing a master reset and starting over with a clean slate (no pun intended.. lol) so hopefully it will be running smoothly after that..
With the Slate, you have a app for pop3, it does not have a magnifying glass like the app for gmail does.. I should have been more specific, since I put all my accounts (gmail too ) into the email app.
switch to a better email app which does support search like k-9 mail or Kaiten (which is the tablet version of k-9).