Hello. I want to buy a device MID. Choose between HSG X5A/X6 and WITS A81E. I'm a little confused and so I have a few questions. 1. What is the difference Phecda P7 from HSG X6/X5a? Are there any hardware/software differences? Which model supports 3G? 2. What is the capacity of the battery and the battery life? Is it possible to replace the battery yourself? 3. What is the stability of the operating system? What are the most offensive problems? 4. What is the real package content? For example, in merimobiles.com for Phecda P7 cover is not available, but for Herotab RK7 it is available Sorry for my English, thanks!