Yeah, they were awesome! I had the blades, the turbo boost, and the tank thing all in the same go!! My mistake was stacking two tank upgrades because then I was too heavy to even move xDDD. The rocket boosters might need a longer cooldown, with the tank upgrade I could just use the boost whenever the countdown started to reset it and by the time it started again, the boost was back up. It was still fun though. I had a lot of fun building up a ginormous horde of cars around me. 10/10 game