Hi asdasd, I have a few of these ones, the best benefit of them is that they are a lot cheaper than some other brands. Also, being a pocket nappy, they dry quickly which is great for Hong Kong.
The thing I do find is that they may not be as absorbent as some others, but that varies from baby to baby. I would say that nearly definitely you'd need more than just the trifold insert that comes with them. At least get a 'night booster' for each nappy you buy. The bamboo pea pods are more absorbent but probably more expensive too, I haven't tried them.
Another tip, I have never heard of any baby needing the large size. My 2.5 year old is still in Mediums, at 16kg.
Overall I do really like them, but they probably have an average reputation rather than excellent. Can you get one or two to try out, and see what you think? Don't forget that the inserts need to be washed a few times before they work properly.
By the way, none of the 'modern' nappies (ones with elastic/velcro/poppers etc) need to be soaked, in fact they don't recommend it. It's only with flat nappies that you'd soak them, and even then that is not essential with washing machines these days.