Bought the Power Cover as 5-6 hours just isn't enough battery when I'm at school all day where wall outlets are hard to come by. Love it so far. Keys have more depth and are more click, and the extra weight balances the keyboard nicely when it's on your lap or a desk. It gives me around 60-70% extra battery life overall. Only negative so far is that it doesn't cover the top of the screen when closed, which his why... ...It works great with the Maroo Folio case I'm using - especially when I'm sitting back on a sofa with my legs up, there's a bunch of various settings you can put the Maroo case in that just make for a very comfortable experience that I wasn't getting with the SP3 Type Cover, which, due to its size, always seemed to ride up into my wrists uncomfortably unless I was at a desk. Some pics of my after-work couching skills (cat kept trying to photobomb).