LOVE the game. HATE the price. The game is fun and engaging — often challenging and rewarding. However, there are only the same four puzzle sets that are in the free version (in-app purchases, or lots of earned coins for access to 2, 3, and 4). The daily puzzles (those 1000+ games they mention) are available — for free — in the free app, and all the ten bucks gets you is endless coins — which I guess saves you a fiver.
I got addicted to the free version, and I was seriously aggravated to find that there were actually no new games.
Either way, if you're willing to pay the price — it's a totally fun game.