I had wanted a pair of Chacos for several years. I have two pairs of their flip-flops already, but I wanted real outdoors sandals. So back in the winter I had finally bought a pair because I found them on deep discount. Once I figured out how to adjust the straps, they were very comfortable, but I didn't wear them much - it being winter. Come summer, I'd wear them to a hike, but not while doing anything strenuous.
Then I wore them around camp on a trip to Frozen Head. I discovered that the toe strap on my right foot would slowly tighten up as I walked. Every half mile or so I'd have to take it off and loosen the strap. This was clearly not going to work.
I sent Chaco an email explaining my problem. They immediately got back to me, saying that this was a problem for some people. Either the straps were too slick, or it was the way that I walked. In any case, if I would send them back, they would send me a new pair - a different model if I preferred. So, I sent them back and requested a similar pair without the toe strap. A few days ago they arrived. There was no charge, even though I'd had the sandals for a while, nor did I have to go through any rigamarole about showing receipts or proof that my toe was slowly having its blood supply cut off. And all communication was online - no waiting on hold while Muzak played.
So buy Chacos. They have good customer service.