I started this thread to share my experience in ordering and installing two Swytch kits. I orginally ordered the Pro kit for $600 plus $50 in shipping. This will be a 27 inch wheel for our tandem. I went back and forth on changing to a 700c wheel. In the end there is an additional discount if you add additional kits to your order. My 2nd kit is the Eco for $449.
The 2nd kit will be a 700c wheel for the wife's bike. By ordering two kits we now have a backup battery pack for either bike, extending the range for both types of rides.
The wheels are double walled with 16 gauge spokes. I didn't order the various accessories like throttle or brake sensors. This system is push button to select the assistance level and the motor cuts of when you stop pedaling.