Originally posted by lawjie that YongNuo manual flash attached on my camera just couldn't make the natural-look light.
Three cheap Yongnuo manual wireless flashes off camera and you'll have as sophisticated setup as he did. With the Yongnuo controller on your hotshoe you won't even have to reach up to the top of your stands to adjust their power outputs.
It is much more versatile, too, able to work across your bodies of most brands (a Sony will need an adapter).
The Nikon Commander system (like Pentax wireless) requires line of sight. A cheap radio option means you can put flashes behind a bush, couch, through doorway of adjoining corridor, etc.
There are Canons with inbuilt radio but one is costly, let alone three or four.