I have been using the latest release of SPP4 and have found it to be a big improvement for higher ISO shots. I can now shoot at 800 ISO with a +1 bias (equals 400 ISO) and the results are so good it is hard to tell they are not 100 ISO shots.
The other benefit of shooting at higher ISO is that the green cast that you see at lower speed is gone.
The other benefit of shooting at higher ISO is that the green cast that you see at lower speed is gone.