mattgemmell, A modest request, from authors and other artists (like app developers and so on) — if you like someone’s work, it REALLY HELPS if you give it a star-rating in relevant online stores.
It’s not about vanity, or word-of-mouth; those ratings algorithmically determine whether the book/app/etc is promoted to others, which in turn affects sales/downloads, and thus livelihoods. They control visibility!
You don’t have to write a review, which I know can be difficult, but please click the stars! ★★★★★