I did 8 miles yesterday with regular shoes... I can say that the ride was a little harder, well not harder just not as positive...the day before i used the clipless and it was more positive....the stroke was easier to deliver...That is my noob opinion and i am glad i got them...I am just building my endurance now...started at 2 miles and now after 3 weeks doing 8 miles....i will get there...i am lovin it...