thought the throttle does feel a bit better, but tbh its probably just a placebo because i read it on here!
LOL, should help it pick up a bit better from low revs, eliminate the "EGR flatspot", and yes, the throttle can feel a bit more responsive, its not a usually massive difference, (depends on the car) they recon you need a 10% power increase to have a noticable increase in power, you might see a (slight) difference with a stopwatch or on a dyno
As Sal has said, the main thing is the inlet/ EGR housing no longer gets contaminated
Cleaning out the inlet manifold and EGR and resetting the ECU may give more noticable gains (especially if the inlet is badly choked up with carbon/ gunge from the EGR)
Theoretically there should be a slight increase in MPG as well, it would be good to get feedback/ figures about that