I used the Simms Rivertek Boots with Boa laces for 2 seasons, with 70 days on them the first year and 80 days the second. I also do a lot of kms on most days. They first started breaking down around day 75 (early into second season) and by the end, they were in rough, rough shape. I replaced a set of laces in each, but I had to buy them from a local shop as I didn't realize Simms would replace them for free as some of you are saying. In the end, that many days on a pair of boots isn't bad. I didn't buy them again, but I enjoyed them on my feet and think that would last some guys several seasons.