I have now been riding the Sirocco CD for 2 months (with no mechanical issues) to assist with losing weight and recovery from a heart attack. The bike is built like a tank with chunky tyres, I feel very secure on it despite not riding for 17 years.The plain black paintwork is stylish yet does not shout out " I am an expensive bike worth stealing". I have also added a pannier double bag, which hides the battery.My routes have varied with a range of terrain (nothing too onerous) from 2 miles to 12 miles so far and this bike has coped superbly with the battery usage and the smooth application of power and I have managed to change gear smoothly as well with the practice of applying slight pressure to the brakes before changing gear about a second later. The motor is very quiet so I need to ring the bell when approaching pedestrians. Tackling hills - you do need to be in the right gear and you do need to pedal to maintain a speed of approx 6- 8 mph. The leg action in pedalling, whilst being able to manage the stress by use of the battery, has been instrumental in my return to health (along side other exercise and diet) Please seek advice from you Doctor if you are in similar circumstances. I have now lost 3 stone from my pre heart attack weight of 19 stone 9 lbs. A big thank you to Woosh Bikes - highly reconmended.