ST-1 Platinum. 14 months, 5,000 miles. 3rd chain, 2nd cassette, 2nd set of brake pads. Upgraded tires to schwalbe marathon plus - no flats in 3500 miles since I put them on. 205lbs, Bodyfloat seat post, pedal hard. No battery or motor problems. I ride in city mode 30% on a windy path with stops...