I have the Oberg one and it works nicely, in my experience. The only thing approaching a problem is that you can't shorten the cable easily, say, if you have your crane at max height and still need a couple inches more lift. With a chain, you can do that.
If you decide to get one, shop around a bit; don't just go to Moss. You'll save a lot of money. The Usual Suspects are OK (sort of...) for things you can't get anywhere else, but for general items like this, they are probably the most expensive option of all.