There are some odd glitches with the interface. Not debilitating issues but some oddities here and there.
When you are waking yours up from hibernation, have you tried typing a capital letter as the first character of the password to login? When I do that the cap only stays active for a second and then reverts back to lower case. I often just use the caps lock to hit the capital letters when initially logging in.
You are right, the screen aspect ratio is interesting. Not quite as wide as I would like sometimes and rather tall in some ways. While odd in some instances it works wonderfully for reading Kindle books.
The good side of this is that it is really easy to carry around and if I can find a folio case with a bluetooth keyboard that fits it better than my Tsirtech (made for the ipad) then it will likely go nearly everywhere with me.
The included case is fine but I wish it worked better for propping the Slate upright. Are you using the factory folio case?