I bought nexus 7 a month ago . Processor: 1.2 Ghz Quadcore, Ram: 1GB. No rear camera, only front camera.
Resolution 1200*800.No calling facility. Data Connectivity Only WiFi. When it updated to 5.0 lollipop, it became so laggy.Unfortunately I am unable to go back to the earlier version. When fully charged, able to browse one full day.One of biggest advantages is it doesnt support some apps like whatsapp, SBI online anywhere which are necessary for me. If you are planning to buy nexus 7 for alternative to laptop I wont recommend. Instead go for Asus fe380cg, which has dual sim support with calling, WIFI+ 3G, 8inch screen.