i have R1 for 2years, just upgraded cervelo P2. before you use the warranty you will sell this R1.
light weight, performance is normally, good for beginner. if you need to accelerate to 45km/hr while you are at 38km/hr (sram apex + itm phantom wheelsets), you need to input many effort.
difficult to keep constant speed at 35km/hr for 30mins, it is because of the design of the frame, it wastes quit a lot of energy. original handle bar and stem are heavy, not full carbon, you may need to change them.