Pretty good game for iPhone users
I'll tell you why:
1) It's not one of those games that you keep playing. You HAVE to wait for plants to grow or for items to be built. You can speed it up by using 'smurfberries' but otherwise you'll have to wait hours most of the time. This is great because adults can leave the game and totally close the app but the hours will still count. So if you play at 10am and then grow some veggies that take 12 hours, they will be ready at 10pm even if the app is closed. And the best part is that the app will push a notification to you to harvest them so that they dont get spoilt.
2) If you don't want to wait hours, then yes, you can use smurfberries which you can collect (very slowly) or buy them at ridiculously high prices. These prices aren't what kids can afford - so yes, it's for adults who've got $$$ to blow!
Even though the game started a few days ago for me, I've only played it for maybe half an hour or so because I spend a few minutes and then carry on with my day. And then another few minutes later on to grow more plants or whatever, so it's a pretty good approach from the developers.
It's a free app, so go for it!