Depends on what you use it for. When I was an affiliate marketer I used it a lot for auto posting. But I obviously don't recommend you do that for any legitimate site (or at all really). These days the chief value I get from it is generating keyword lists. It is fairly powerful. When you build a list, you can then copy the generated list to your seed list, and generate even more.
In addition to this, it is useful for performing google "dorks" to find sites that may be of interest to you for linking, or some other reason.