Ok. Chrono V1 is a wild beast. It brings the fire breathing dragon. Yes its less stable and more tip tucking if you fly it bad. It was the original depower race kite.R1 in is the second gen race kite. Its more stable and inflates better. Some reports have stated that R1 is not quite as fast as chrono V1.
Chrono V2 is a down tuned slightly lower aspect chrono. It has normal bridles rather than wafer thin bitches. Its more stable again and easier to fly by misses the firebreathing dragon.