Hi b4
despite having owned both Bosch (KTM) andYamaha (Haibike) I have experienced no power delivery issues with the C1 on a Trek 3.
I couldn't say whether it's cadence or torque sending when actually riding in power On mode
the feeling is one of having a pair of top $ legs that have slept well, rather than a pair of 83 year old slightly knackered ones, even in the lowest (yellow) power setting.
having + or - of 70% of the battery left after 30 miles, means that for a good chunk of time we were cycling unpowered, as the Trek (although not "light") feels great unpowered, and not too dissimilar to our 9.5 kg Islabikes Janis.....
the front wheel motor offers no resistance and you wouldn't know it was there.
The hills around Hertfordshire can be steep but usually short, so with the 40x40 gearing on the Trek, a lot can be ridden before using the 'get out of jail free' button.
Having just come back from Tuscany, the hills there are a different story, meaning sometimes a 5km+ climbs
And old legs (my wife is 81) means a lot of power is needed, but even so a 25mile 500 meter climbing day left 12% in the battery
we are just booking for a weeks cycling on the Spanish/Portuguese border, where distances are 35+ miles and 5/600meters of climbing.
September should still be warm, but we will carry our very small battery chargers with us as you get 25% in 30 mins coffee stop.....IF there is a coffee shop en route of course!
aesthetics of the battery bottle are mmmm, but in frame batteries just wouldn't work either on holiday or at home, so basically "needs must"
a pretty bullet proof kit, as all electric connections are made in house, and nothing really exposed to the elements.
Even after 1000 miles on the back of the car in foul conditions!
cheers Barry C