I haven't had it long but have not noticed any lag at all. I absolutely love Windows 8.1 (I actually have the 8.1 Update version through the Preview for Developers app) and loved the option of 'changing the size and number of Tiles available on your Start screen', found under Start+theme. meizu mobile phone Even though this has a snapdragon 200 processor, it runs just fine for me.
There are two SIM card slots and the only annoying thing for me is that you cannot remove the icon at the top of screen for whichever slot you're not using (either 1 or 2). I've also noticed that when I'm looking at my contacts, there is a setting for SIM 1 and SIM 2 to make your call on, with the default being SIM 1. Again, no big deal unless you're using slot #2.
I cannot give you detailed information on the battery life yet but will update this within a few days.
So far I am very impressed and I'm pretty sure you will be too. In case you're wondering, I've used Blackberry, IOS and Android in the past, and am perfectly happy with Windows, as long as you're running 8.1 on it.
First off, you get all the following in the box: Plastic case (same color); battery, two (2) screen protectors (one pre-installed); headphones and wall charger. buy oppo n1 Once you plug it in, at least in my case, BLU automatically updates your phone to their latest firmware, which is impressive to say the least.
I came from the 6" Lumia 1520, which has been an awesome phone for me but I always felt it was one inch too big, and since I'm on AT&T, I have been waiting for a 5" like this to come out. I am pleasantly surprised with how this runs.