I used PWA for a few years. They're a fine service. But I found running multiple reports rather cumbersome, and it took a lot of time to look at the manuscript from several angles. Also, many of PWA's suggestions were false flags, which meant I spent a lot of time saying no-no-no, that's not an error.
PWA does work with Scrivener, but it did odd little things to my RTF files. Like, if I fixed a quotation mark in PWA, when I went back to Scrivener it would have turned that curly quote into a straight quote, and then I'd have to hunt those things down in formatting because they didn't convert quite right.
These days I use Word's editor (Surprisingly great! It's come a long way over the years.) and the "read aloud" feature, then I send the manuscript off to a proofreader to pick up the few little things I missed. I still think PWA is useful software, but my new way is faster and every week I can free up for writing is money in the bank. Human proofreaders are also better at catching things like "You changed that character's name in Chapter Five."
Wonder