Sony Case vs Others
Yes the cheap case shown above will do the trick as far as protection/ magnetic charging.
, that being said, think about how much you invested in the tablet. I have used the cheap knock off version case and now I have the Sony case. Big difference in protection, feel,its still super thin and quality. In my opinion, invest in a good case to protect that high class tablet you have.
You can get the authentic sony case through Ebay (Sony store) for cheaper than the website. Fast shipping and reasonable for a tablet case cost. Remember that tablet cases will cost more than phone cases too...if you go for quality!