No one asked for this but...
The normal one works like charm, although it's slow because you obviously have to wait for the new keys. Another problem is that the moment a new version is released, you have to download the new mod apk and start every book from the beginning.
The VIP version is pretty much useless: I could read five chapters in a row but then I got this message. As it turned out, all I had to do was wait for a while, but even then I could only read one or two chapters before this message popped up again. Guess we're back to the wait for keys thing.
I'll keep using these because I want to be up-to-date with Queen B and MTFL, and I also don't want to spend actually-paid-for diamonds on them (for now).
Since I use the VIP mod on my phone and the basic mod on my backup phone, I signed in with my old account on my iPad (I already spent a shitload of money on diamonds back in the day) and started playing with shitty books to get free diamonds. Now, this a slow process, I think we can all agree, so here's what I did.
The VIP subscription is fucking expensive but I did a little math: the basic key and diamond prices aren't exactly low, right? BUT if I subscribe for VIP for 1 month and then immediately cancel it, I have 1 month with unlimited keys, an extra 185 diamonds as a gift, 2 extra diamonds at the end of each chapter and 10 daily check ins.
This is more than I would get with the same amount of money. Let's get the most out of the next month then!