Actually I've been in China twice to train there a couple of weeks each time. Those trips were really nice. I was in a sports school in Beijing (same from where Ma Long and Ding Ning has come from). It was 5h training/day and 6 days/week. This school had quite young players, everything from 7 to 15- or 16- years old I believe.
The trainings were very different than European trainings. Firstly, the warming up was very long, we hit sometimes like 20 minutes only FH.. Secondly, the exercises we made was quite easy. The point in that was to do many repeats and in that way become a more secure player. Even the youngest were like machines when doing those exercises, they were so secure doing them. But when we started to play matches it was different of course, it was quite easy to win the youngest players because they didn't really have match experience (retrieving serves etc.).
The couches were quite tight on the chinese players, they really wanted them to do well when they played against us. They made sure that we got good practice, even though they didn't give us so much advices. But what they taught us was totally different things than we had been taught to here in Europe. The technique is so different (especially for FH). After some weeks of training there I had my best FH ever, but when I returned back to Finland it kind of disappeared again because nobody knows that real (chinese) technique. So my playing style kind of returned to the same old "European"-style after some months.
Anyway it was truly amazing trips. I totally recommend to go and experience it yourself also. You can't imagine the level of the players before you see them with your own eyes. We actually also got to play with maybe the best 7-year-old boy in the world, he was unbelievable good. But table tennis is probably the only sport in the world that makes it possible for a 7-year-old to be as good as many (ok/good-leveled) adults.