I would say they are not durable at all. I think I've gone through five miccon cables. I haven't tried to warranty them. The strain relief is inadequeate between the cable itself and the connector. I had the idea of putting heatshrink tubing around the ends for extra durability, but I gave up on my Rode lav and Miccon accessories, so I never tried it. Countryman reinforces their strain reliefs with an extra layer, and my EMW's show no sign of breakage at the connector from use.
Also, it's very easy to overcrank the connection between the cable and the terminator, and ruin the terminator because it's end is now snapped off. But if it's too loose, the signal degrades. Tough to get right. Without cranking hard, I always worried about the connector's twisting loose while on the talent.
Rode Lav was definitely my favorite when I starting out and didn't have my own wireless yet. It make it easy to switch between XLR and Sennheisser locking 1/8th for when we did get wireless. Then I got my own wireless and that ability became a moot point.