Questions about Studio 1558 w/ i7

I haven't been able to find any good reviews for the new studio 15s with i7 + ATI 5470 and 1080p screens. I am mainly concerned about the battery life on these compared to the i5 model. Is it worth it to do the i7 upgrade considering price vs speed (its clocked significantly lower than i5). Also does this seem like a reasonable price for this notebook? $434 off + $90 Coupon Dell Studio 15 (1558) Core i7 Quad-core 15.6" LED-backlit Laptop - LogicBUY

 

I have the studio with i7 and ATI...720 screen though...I LOVE it...except the cursor randomly gets huge...I've had it for 2 days though...But late last night I installed new Bios and Catylyst 10.6 as people said this seemed to fix the cursor issue...knock on wood haven't had the problem today...and usually it's been like 1-2 times per hour up until today!!

 

I've got the 9-cell, and it's roughly 3 1/2 - 4 hours on wireless, depending on what I'm doing.

As noted, A06 and 10.6 updates will take care of the large cursor and frozen display issues.

That price seems pretty good, but you might get a better price off the Outlet, and added flexibility on the warranty.

 

The reason I have chosen an i5 instead of an i7 is the battery life. With a normal 6-cell battery, you only get about 2 hours of battery life, which is too short.

 

performance wise, is there a BIG difference with the i5 and i7?