Well, after a stupid crash day before yesterday I decided to finally put on my CF main blades because I'm actually too broke to buy another set at the moment, and I've had them in my tool box since the day I bought the heli. They were there to entice me to leanr to get good enough so I could justify using them... Well, as it turns out, I have all of the upgrades excepting the aluminum swash, and the CF blades from E-Flite already on the copter, so this rounded out the package pretty much. I have to say I was amazed at the differance they made. It was phenominal, it spools up faster, and it was way more stable than it ever has been in the past!! I was able to take thumb off of the right stick completely for nearly 5 or 6 seconds before needing to make a correction at all, and even then, it was only a small correction. In short, as soon as your good enough that you have the aerobatics kit on the heli, and when you do crash you think, "wow, that hasn't happened in like forever!" Go ahead and put them on! I should have put them on a while ago.