At the age of 78 , finding that living on a steep hill was becoming less conducive to cycling and recommended by friends, I ordered a Swytch Kit Max. Yes, it took a while for it to arrive but having now installed the kit, completely by myself, it was well worth the wait. It's amazing and cycling is fun again and more importantly I can zoom up the hill with my shopping.. I found the manual precise and easy to follow and working through step by step the installation took me about 4 hours ...with a few coffee breaks! I would thoroughly recommend a Swytch Kit to septuagenarians everywhere.