I just received the {Poetic hardback slim fit case which looks similar to the one in this link but does not have any auto wake/sleep function. This is the link attached to my Amazon order account but I paid $6.95. In the past few days the price has changed from $4.95 to $9.95 and the retail price has changed $10-$15 as well.
Amazon.com: Poetic HardBack Protective Case for Google Nexus 10 (With Auto Sleep/Wake Function) (3 Year Warranty by Poetic): Computers & Accessories
In any case, I could not figure out how to use it as it comes with three pairs of tabs on each side to enclose the tablet. But you can't use the bottom pair if you want the tablet to use the case/s stand function. Once I figured out to just use the top two pairs of tabs, everything worked great.
All buttons, speakers,ports et al are totally in the clear. The case may be plastic but feels like a stiff artificial fabric (leatherette?) and my fingers easily grip it without any slide. There is a hand pocket to use only in the portrait mode but I'm a landscape kind of guy.
There are 3 upright positions and the tablet feels secure in each. I use the stand mainly when in bed and it works well.
There is a clasp/tab to keep the tablet closed and it is a bit difficult to open up once closed as it works with pressure by slipping over the edge of the tablet. There is a piece of cloth to pull on to help get the cover open, however.
I've been using a HP sleeve to protect the tablet until this was delivered. The tablet in this case still fit inside the sleeve for some extra protection.
For the $6.95 + free shipping that I paid with the preorder, it's a steal.
Shelly