Google wants its Nexus 9 tablet to be a productivity monster, to compete with the Microsoft Surface Pro 3 and the iPad Air 2. In that case, a keyboard is absolutely necessary, so there's now an official Nexus 9 keyboard case from Google and HTC called the Keyboard Folio ($129). Unfortunately, it's more expensive than it should be, and it's not made particularly well, either.The Nexus 9 Keyboard Folio is a slim, black faux-leather case that your Nexus 9 tablet magnetically snaps into. Open it up, and your tablet automatically wakes up. A folding panel lets you hold the tablet in portrait mode like a book, or slide the tablet down into a laptop-like form factor with two different screen angles. You can also fold part of the case down to reveal the tablet's camera. As it's a magnetic case, you need to make sure when you're opening it to grip your tablet by the slate itself, not by the case, which will peel away. I'd like to see an option to clip the folio more securely to the tablet.There are many kinds of cheap ipad mini cases on the market.Mark May of Citigroup commented in a note on Thursday that Google Inc's (NASDAQ: GOOG) potential loss of being the default search agreement on Apple Inc.'s (NASDAQ: AAPL) mobile Safari browser represents a “a near-term and quantifiable risk.”“We estimate that Google's total world-wide search revenue will be $51 billion in 2014, of which $12 billion or 24 percent will come from mobile devices,” May wrote. “Of this, we estimate that $7.2 billion or 60 percent of total mobile search revenue in 2014 will come from its default search deal with Apple's Safari mobile browser.”Citigroup advised long-term investors to hang onto Google (GOOGL) , (GOOG) . Although Google would be significantly hurt by the loss of its search engine deal with Apple (AAPL) , Google's stock largely reflects this scenario already, Citi contended. WHAT'S NEW: Google's stock already largely reflects the potential loss of Google's search engine deal with Apple, Citigroup analyst MArk May wrote in a note to investors today. Citigroup says investors became increasingly concerned that Google could lose the contract after Apple recently switched its mobile search provider for Siri and Spotlight from Google to Microsoft’s (MSFT) Bing and Mozilla recently switched from Google to Yahoo! (YHOO) , Yandex (YNDX) and Baidu (BIDU) in several countries. If Google is completely removed as the default search engine for Apple's Safari browser, Google's revenue would drop by $6.6B in 2015 and its 2015 EBITDA, excluding certain items, would take a $3.4B, or 11%, hit, the analyst estimated. After factoring in this scenario to his forward estimates and adjusting for growth, May estimates that Google is trading at an EBITDA multiple that is in-line with other U.S.-listed large cap Internet stocks. He kept a $652 price target and Buy rating on the shares. You may interested on: best cases for iPhone 6 plus and unique iphone 5/5S cases