Ugh, I'm on my third power adapter for my Macbook (which I've had for about four years). The current one is starting to get that kink, but it's still working, so I'm keeping my fingers crossed. It's such a poor design. Also frustrating is that when you replace them, instead of warrantying the adapter separately, the part goes under the warranty of your computer, even if you bought it separately/later. The last power adapter (which I bought two years AFTER I bought my computer) lasted for about six months, but since my Applecare had recently expired, I couldn't get any break from the warranty. They ought to be warrantied individually for at least a year, don't you think?