Hello, I want to buy Zenithink C91 ZT-280 tablet and I have some questions. Zenithink 1. I watched videos on youtube about this tablet, and I noticed that response to touch is not "smooth" like in iPad or other tablets. For example: Here it's look much better: It is true? beacuse it can be very annoying.. 2. Most of the sellers in ebay sells the tablet with android 2.3, I understood that in the last month, Zenithink upgraded the version to android 4.0 This upgrade is important? there is change in the firmware also? 3. There is a built-in GPS receiver? If not, can I connect a USB GPS receiver? 4. I need the tablet Especiallyfor web browsing,Skype,GPSandGoogleMaps but also for see movies (the quality doesn't have to be HD...) This tablet is good for me? there are cons I have to know? Thank you!