I happened to try these shoes while on vacation - when my regular running shoes broke down. First run was an 11 miler... and the first three miles my mile time dropped by at least a full minute. Miles 4-8 were cut by 30-35 seconds and by mile 10 I was back to my regular cadence, yet felt fresh and not my usual beaten up.

My last pair lasted about 150 - 175 miles, not a long time, but at the time I was running at 175-177 lbs, running an average 25 - 45 miles a week. I stocked up on these while on sale at amazon (average price $45.00) can't wait to blow through these so I can try the kinvara 3s