so i had a pair of z/2's for a year or so and the strap broke off at the outside heel connection/mount to the sole...bummer. called up chaco and they replaced them for free! great customer service. i got a sweet deal on here for some zong's (z/2's without the backstrap) and i love those for casual mainly but would trust them on a light trail hike any day of the week. about a month ago i got an even better deal for some zx/1's and havent taken them off of my feet since. everyday i have an internal struggle as to which pair i want to wear that day. my favorite pair that i have are my z/2's because that is what my foot is used to the most (the toe strap is so amazing, your foot is so secure its incredible). if i could wear these to work, i wouldnt hesitate for a second and i would literally never be seen without a pair on...even in the winter.