I used to buy boosters regularly and use them. But since they switched to only being able to buy boosters for an amount of time (rather than a count of them), I no longer buy them. I don’t have 3 hours to just play the game and use the boosters. I also agree that the levels seem more like luck than strategy to complete and…
Bottles are my least favorite because the game seems to be geared towards not completing the level. I barely get by on luck and usually have to spend several days on them and it gets too boring.