I had the X5s for about 3 or 4 months. The sleeves are thin, but i treated them with kid gloves and had no issues. Some people have had issues with the sleeves cracking and so i was always very delicate when handling them and at one stage even put insulation tape around the sleeves.
I have read somewhere that Klipsch replaces them under warranty for cracked sleeves, but you should check with Klipsch to confirm that.
They are the best isolating IEMs i have owned (dangerously so at times) and they are deep insertion.
