Having also had a Shadow, I can tell you the R3 is a significantly different beast. Honestly, if you respect the power and ride within your capabilities (which will grow over time on these bikes) you'll be fine... Better than fine .. . You'll be hooked on the torque and power. Above 15mph she's VERY nimble. Below and coming to a stop, proper braking, throttle control in the friction zone and handlebar control is critical with the weight. Note, I have a '14 Touring which is about 1100lbs with me on her.
-MIG