I've had many pairs of Mechanix come apart after almost no use myself, but then some people find they last ages. I've personally found the fit to be pretty bad, especially on the fastfits and I know I had the sizing right, but finger length, palm size etc etc all varies massively person to person.
I get asked this a lot, probably more than anything else and I recommend the PIG FDT Deltas to folks these days after trying all the good and popular options over the years. Most of my gloves are the Alphas and I use those most but that's because I bought them all years ago before the Deltas came around. If you want thin construction and dexterity specifically over protection (which is my preference for sure) the PIG line are popular around the world for good reason.