I bought my A806 from directd. the problem is it preinstalled with many useless chinese apps. they are under system app that can't be uninstall. and sometimes the phone can be very unresponsive even i just want to open the Contact page...i suspect the OS is really not optimize with the hardware. I just don't get the "smoothness" of what an Octa core suppose to offer

I found a bug from my phone too. when i pull down the notification bar, and press the "MOre" option, it will keep prompt out this message "Notification Center is not working". I cannot cancel this message and I force to do factory reset, which wipe out all user data

I have not tried the LTE. I think the 3G connection quality is average only. Compare to previous model A706, battery life improve a bit. I just think with a good OS only it can fully utilize the potential of the Octa core processor

I also don't think it is good for gaming because of touch screen is not sensitive enough - this is what you get for this price.

Now Redmi Note also got 4G model, maybe I should look for one

you using stock ROM? what is the version?
I believed mine come with a lousy ROM