I do think that attempts to create something original can be helped by this, but only if it's used carefully. After I've reworked something many times, the parts I've fiddled with the most are often too complicated and obscure.

I've gotten a bit of use out of this, but only by throwing it at things which are already written and edited, and then ignoring most of it's suggestions. I end up treating it as a list of things to check, not a list of problems to fix.

I don't think that's necessarily true. I think you can use it to quickly identify passages that may need more work. As with all suggestions, take them with a grain of salt, but so far even with highly edited work, I find it can be useful.