Hello All C7 and N8 user..
I would like to share my experience..
I currently use both C7 and N8, and I do a lot of heavy workload on it..

Everything goes worst when :
1. There a lot running application like reading pdf file, quick office, web surfing, playing music in one time..
2. When I start using an after market theme. (Really Quite Disappointed)..
3. When I do not turn off my phone for a week.. yes.. It is the worst ever..

But, It doing well and i really fell in love with them when :
1. I use default theme..
2. Clear all history in web apps once i done my surfing.
3. Close all apps properly every time when not use it anymore.
4. Never use fancy app like dummy apple slide to open apps.
4. Every night, I shut down this phone for 30 min. (to clear all data maybe.)

I assume, this is just like pc with atom compare with i7 pc.. Need more patience rather abuse it with heavy load..
Pity it...