this is the first time wearing saucony for me and it was rather of a toss up as to what running shoe to buy as i am so attached to new balance. However they stopped making the MR1400 model. Anyway, this shoe does not even need 'breaking in' as it is a soft comfortable fit from the beginning. I am accustomed wearing 9.5 in new balance and my size remained the same with these saucony. Its very light but does offer a lot of cushioning for its weight. The heel height is a tad bit higher than i am accustomed to but its extremely comfortable all the same. Materials are extremely breathable and feels like a perfect comfort strike with each strike to ground. i would definitely buy again.