E-Brompton with Swytch kit: commuting is no longer the same First of all, I was surprised (Note: it's my first experience with an e-bike) by the acceleration power of the engine... a bomb! Climbs no longer exist, with my 3 gear when you exceeded a 4% gradient the pedaling was quite hard without the engine. The installation was simple and I had fun understanding how to manage the passage of the cables also to allow it to be folded without problems. With the engine off, you can feel the resistance of the engine when starting to pedal, less during the bike ride on a flat ground. I appreciated the rather smooth power transmission mode and the relative silence of the engine. The lightness and compactness of the kit - I took the Swytch max kit with an overall weight of the bike increased by only 3.5kg - comes at the expense of a not exceptional declared autonomy of 30km: after four months of use I travel about 45km and 400m D+ elevation a week with 2 full battery charges. I quote from another review the ONLY NEGATIVE NOTE regarding the Swytch kit I found: "...the computer part and the battery both have power indicators and yet they almost never agree with each other. The computer power level indicator shrinks very quickly and will cut out and stop sending power to the motor even though the battery indicator is still showing three of five lights meaning there should be at least 50% of battery left. What makes this even worse is that when power is not actively being sent to the motor there is considerable drag against your self-powered pedaling. Then if I stop at a stop sign or for a minute or two on the side of the road the power indicator on the computer goes back up and now I have power again. So there's something wrong in the programming that hopefully could be fixed for future models. It's really frustrating to see that your battery has more than 50% power and the brain of the whole thing decide that you have zero." Ultimately, I really appreciate the electric assistance of Swytch kit but I strongly recommend to buy the MAX battery pack in order to have a reasonable riding distance between recharges.