@aankush
Trouble with all this Tablets on Ebay is one can never be 100% sure of the Specifications mentioned. Found a link where one of the tablet's specs in your list was faked to contain A8 Cortex CPU.
Link http://www.slatedroi...hp?topic=3787.0
Having said that Rs. 11,990 Tablet looks better in Specs(If they are true) with Android 2.2 but with Odd Screen Resolution of 800x600 (4:3). It mentions 3D Accelerometer (Whatever that means) but not clearly mentioning whether all 4 side screen rotation is there or not. The other one mentions 4 side screen rotation. This one says Flash 10.1 support but i doubt it. Mentions Full HD 1080p support but no mention whether an HDMI port is there.
Ask the Ebay Seller all this questions before buying.
How reliable this tablets are? Only you can answer that question after buying and using for some time.
This will be Resistive Touch Screens.
See don't consider this chinese tablets with ipads, Samsung Tab etc. If you are a very tech savvy user with lot of cash and very early adopter of technology ready to pay very large price premium to Apple and Samsung, don't consider it..... Not for you then.
For normal users, this cheap cost chinese tablets can be a good route to try the Tablet World with some quality limitations but most of the functions working reasonably well.