I use to subscribe to the "need spare parts" crowd. Not down playing it at all, however, I have found that I like to keep parts that wear out on hand (mostly bearings) and purchase what is needed after the crash. I do have some that I keep as a must, main shaft, feathering shaft, all bearings for the head and main shaft plus bearings in the tail. I have found it hard to keep "all" the parts on hand that are needed unless you have another kit. Soooo... I rather have a back up bird or two ready to go..