I've used some 400H and do like it, but have realized I need to learn how to use it. It is good film, but I've decided I don't like it with skin tones (if doing portraits - it's okay if people are incidentally in the photo) or with a lot of green foliage.
I've tried EIs of 400 and 320 with good results, but have decided that for me, the film "wants" certain scenes more than certain EIs. The results I like best are outdoors on overcast or partly overcast days (or general low/soft light), with brown leaves, trees, bricks, etc. Some green is good, but a scene with a lot of greenery seems to be a bit overwhelming.
I just do snap-shots, though, so I'm sure there are many who know how to use this film on whatever they want with great results.