Hi Alex.
I'm not sure if I abused it or not. I do like to get right into the reveal on a clean and this necessitates a certain amount of scrubbing and abrasion, but I did expect it to last longer. I found it stayed put on the brush and didn't move at all. I bought 2 at the time and use the 2nd on my 2' (cut down SLX) pole. It gets less use and so will last longer.
I guess there is a compromise between stretchability to get it on the brush stock, and durability: soft materials wear quicker than harder. For comparisson a Supalite lasts me between 3 and 4 months before I have to replace it (having turned it once on the head so the worn bit at the top is at the bottom).