Ditto! I ordered two packs of the metal CE2s, but erroneously received the plastic ones on July 27. I read that the thicker tubes were less prone to cracking so my wife and I figured we'd give them a try. They were babied and never put in a pocket while on the battery, etc. The 4 in use cracked at the base within 2-4 days. I put superglue on the cracks and tightly wrapped a 1/4" of packing tape around the base. One of my wife's has cracked again in another spot. I suspect it's the side pressure on the cup from inserting the needle.
I love being able to see the fluid level, but quite disappointed given that I still have a few functioning metal ones that are 4 months old. I'm debating if I want to go through the effort and shipping cost of exchanging the other pack for what I ordered...