Have had a horse on the interlocking stall mats for a month now and no uneven edges or issues with mats separating/moving. Right amount of traction so horse does not slip but does not catch on muck fork. Stall is easier to muck and much cleaner than with past experience with non-interlocking mats. Did have to cut the mats down a bit to fit in place (took into account that they expand with the heat and contract with the cold). Husband used a circular saw and soap, messy but did the trick. Very satisfied with price and product!