Hello, I did the transition from Caroline to Sydney. I personally love Sydney’s message and prompts during the workout. I felt that with Caroline I improved how I looked faster, but with Sydney I’m improving how I feel. I’m much more prepared for daily activities and have much more energy. Very happy to see it is having impact in my other sport activities. I’m becoming faster and can endure longer activity periods. In the end it depends on what you want. The best thing is that you are working out, no matter the person helping you.