Perhaps it has been due to differences in driving style but I have been completely disappointed in my EBC Greenstuff pads. I bought them last summer thinking they would improve braking, reduce dust, and last longer. What I ended up getting was far from what was claimed. They dusted like nothing else, they didn't last, the breaking was only slightly improved, and sometimes they would squeak and squeal.
The dust buildup I get from these things is like nothing else. My rims turn solid black in just 2 weeks. It looks as if I haven't cleaned my rims in 3 or 4 months.
To top it off they already need to be replaced after just 13,000 miles.
I admit I am very hard on my breaks. But I was able to get 20,000 miles out of the stock brakes and they never squeaked and had minimal dust.
I totally recommend either going with the stock OEM parts or a Cobra kit with OEM pads.
Here are some details of my installation.
New Brembo OEM rotors
Anti-squeal goo
New hardware