It's playable if you have the time to grind

But they don't give out the coin rewards properly. I reached 'Luxury 2' with a day to spare, watching all the ads as a free-to-play player. The gem rewards came instantly, but it's been half a day and they still haven't acknowledged it. I've submitted two inquiries, but they were rejected, so I'm writing this out of frustration. Just take the previous rewards and dip.