Yes, the English is 100% grammatically correct. They are sentence spun, not word spun, so you don't have those annoying grammar errors.
When I say that I use them on the moneysite, I specifically mean as posts to fill up a silo or to simply have more pages indexed. Not as sales pages or click pages. Just pure content.
Kontent Machine (Georgi) just sent out an email where KM can now take articles directly from The Leading Articles via an API, and then insert link tokens, and then hand it off to you. Really sweet for those T1's that need quality articles.