Some folks want 3G and the Teclast X70 3G targets those who do. The closest thing to an inexpensive A53 tablet I could find is the MTK8735M A53 Quad core 7 inch tablet pc MQ758M from China Esky Group Limited.
http://eskychina.en.alibaba.com/. It is a swell tablet with several attractive features but it lacks 3G and costs 10% more at wholesale so expect retail to be $70 to $80. In other words, it is not salable into the $50 tablet market. Until someone can point to a credible ARM based $50 tablet, Intel wins on first impression. Of course testing is required. X3 is no game changer, but it appears poised to deliver credible market share at the low end. The silliness that Intel just can't be effective in mobile is, well, silly.
By the way, Intel Ark prices are known wrong (too high). Does anyone know what Intel actually charges for various X3 models? Some call the A53 a $4 SoC. Is that more or less than what Intel asks and how do you know? Absent actual knowledge, it may be most accurate to assess competitiveness based on what is offered in the marketplace. From a historic perspective, ARM is the world so ARM should have the $50 tablet price point covered. What credible competition do they offer for $50 tablets that makes the Teclast X70 3G unsaleable? I think some emerging market folks will find it attractive at the price.