Questions about the Alienware M15x Laptop

Hi it looks like I may be getting this laptop this week, but I was wondering a few things.

1. How good's the battery life? I'm getting the Core i7 720QM, which is the least powerful, how long would it last doing gaming, non-intensive programs like word, or things like internet (over bluetooth tethering to my iPhone).

2. Should I buy the special bag for it, or could I just use my normal school bag.

3. I don't think anyone would know the answer here, but when i'm customizing it on dell.com, I can type in my name for the tag on the bottom. When I go to dell.ca, which is where I need to buy it from, there's no mention of the nametag whatsoever.

Thanks and I hop I can get at least one of my answers.

EDIT: Sorry, one more question

4. If I upgraded to the 9-Cell battery, I'm guessing that would help my battery life, but would it like stick out of the computer or make it bigger in any way?