I'm a bit late to the party, but I now have 19 tanks in my Octane and it's an animal! I don't know how many octanes have sold as it seems videos on YouTube dropped off after last August. There were really never problems with the engines, it was that the manual had the wrong needle settings. I will say it does take 3-4 tanks before it will get out of it's own way and even at around 9 tanks was when mine really woke up. I feel it's worth the money if you don't mind the break in period. Very happy with it.