year to year, not going to see That much difference MOST of the time. if oyur using a 2000 bow, ill be willing to bet a 2007 has some major improvements, especially in the noise and speed department. IMHO. rocket arrows and 100% lett off is a bit extreme, but i dont hink innovation on speed will ever stop, just keep creeping faster and faster. noise cant get much quieter than these new bows, and let off is already unbelievable. i agree somewhat though, these bows sure are awesome.