Amazing; last week a friend told me that at 1600 it gives pretty small grain in DD-X (yes, seriously). I guess everybody has different tolerance levels for grain. If you use it at 200 in perceptol this means you want very small grain. Have you tried, by the way, using FP4 at ISO 250 and developing in undiluted D76, as an alternative? (of course, with a different contrast and shadow detail). I'm eager to test pushing FP4, there are people that push it even 5 stops!