I run DS2500s on the street. Aside from the dust and low-temp squealing, they're a great street sports pad. They pretty much work from the get-go, and are quite resistant to fade on the track. They also lasted twice as long as OEM pads, probably due to the fact that I track the car quite a bit and the OEM pads just shit themselves.
(N.B. This is on a 350Z non-Brembo, so your mileage may vary)
I've never heard a bad thing about DS2500s, performance wise, but the same can't be said for anything in the EBC range.