Well, both son's and I went out yesterday evening for a few hours and stopped for some dinner. On the way home I rolled on the green light and hit Blusa wide open till I went into fourth. There was a F4 biting my ankles like a pit bull! The Great White was watching it all and I was not expecting it actually. That F4 comes alive at 10,000 RMP. She is a monster! We have cleaned everything up and ready for the next roll. Its really a total joy to go out with your son's and ride together. Both of my son's are talking the red carbon fiber BST's for each of their bikes. I think it will be a beautiful upgrade and wish they had the blues one when I bought mine.