The HalfBike is amazing - I love it! It is the perfect balance of exercise and fun. I ride it around my neighborhood (hills and flats) at least three times a week but I mostly look forward to riding my HB in San Francisco on Saturday mornings (Potro Hill, Chse Ctr, Orcl Prk, Embrcdero, Pier39, Crissy flds, Golden Gate, about 20miles r/t). The HB team and Denitsa are awesome and recommend the HB whenever folks ask about it - which is all the time. Thanks for such an amazing machine and riding experience.