On the plus-side for the Brembo's....There's a reason every Mustang that Ford provided for magazine tests had the Brembo Pkg. The tires. The P-Zero summer tires contribute more to handling and braking than any other option. The big 14" rotors will fade less under demanding use.
The negatives (in addition to the $1600 option cost) is very short tire life.
If the car's a daily driver and you drive a bit aggressively, you might be shelling out close to two-grand every year for tires. Also not great in cooler/colder weather and a short 40-series sidewall is not all that comfortable on less than perfect pavement.
On the other hand, the stock brakes -are- pretty damn good; upgraded for '11 with 13.2" front rotors and 2 piston aluminum calipers and the car will still handle great. The all season 18" or 19" tires will perform well year-round ('cept real snow) give a better ride, less chance of wheel damage and last 2-3 times longer and cost 1/2 of the P-Zero's.
I'm still undecided....but -if- I do get the Brembos, the brand-new wheels and P-zeros will be for sale and replaced on my car with take-off GT500/SVT 18" wheels with some meaty 255/45-18 all-season tires. I think the car looks better w/18's and the ride should be improved on the crappy roads around NYC.
Hey, it's not a easy decision esp. if the car will be driven year-round in colder weather. If you are going to drive really hard on the street (preferably on the track) then get the Brembos. If you enjoy a sane blast on country roads on the weekends, up to 7-tenths or so with a little cool-down in between, the stock brake should be fine. At least that's my take up to now.
2011 Kona Blue/Charcoal GT, 400A Premium,6sp MT, HID's, Security Package, Comfort Package, 3.73's, Koni SRT/SteedaSports+Panhard, GT500 Mufflers
'06 Mazda Tribute,'05 Honda ST1300
'03 Yamaha FZ1000 '98 '00 '02 '04 Ford Expedition
'93 Buick Regal '90 Ford Explorer '87 F-250HD Diesel
'85 Yamaha FJ1100 '83 Honda NightHawk 650
'80 Olds Cutlass '70 Ford LTD