Hi, I appreciate the feedback I get on this forum. I had previously posted: I have a new ST3 which felt heavy and nonresponsive. Had difficulty riding on flat. Bike shop finally recognized there was a bike issue, apparently the "brains" of the bike had been sending error messages since initial purchase. (I did not see any errors on my end). I had this part replaced, and noticed immediate improvement. I noticed the power, used only power levels 1 and sometimes 2. Significant power in level 2. I then attempted a ride I had taken many times on my old ST1, 4 hour RT, lots of hills and inclines. I had to turn around after app. a half hour into ride. I was on an incline, guessing app 8-10% grade, gradually increasing to higher grade. I could not make it up this incline. Bike felt heavy, and I felt no power difference between 2 and 3. I am again reaching out to Stromer, and back to my ST1, as I have previously never had any issue on any hill on this particular ride on ST1. I know there must be another issue, my questions, those who ride an ST3, do you recognize an appreciable difference between power levels 2 and 3? Considering this bike is 65 lbs, 20 lbs. heavier than my ST1, I am assuming I should feel the power on an incline, not the bike weight. Thanks for any input.