Rockets (any of them) are very reactive to how they are used, more so than most other machines. If you use it gently it is over-engineered for what it is doing, if you use it hard it is under-engineered for the types of forces it is capable of producing. If you want to do generally gentle cruising it will last forever (there are guys with enormous miles on 2300s), if you are going to be pushing hard you will shorten it's life.