Unless you are using the adapter in an environment where a small fire could reasonably be contained without undue risk to finances or life, you might avoid using a third party adapter if you are not skilled at evaluating electronics for build quality. Also, some have high quality plastics and similar weight so you may have to be very observant to tell a good knockoff from a genuine part. The worst part of counterfeit adapters is that they typically carry the same "safety" markings as a quality electronics adapter. I have seen far, far more dangerous adapters than safe ones.
I have on rare occasion seen some nice third party adapters that work with MagSafe connections - but none yet on MagSafe 2. The MagSafe board on the Mac usually protects your hardware from any sort of short - and it also is replaceable if it's fusing blows. Since the voltage is low on the MagSafe side of the cord, this is more a heat/fire risk than a shock risk. I've seen people decide to use cords when lightly damaged - sealing the cable with electrical tape. The Apple cables appear to be designed to safely melt without starting a fire in cases where the internal insulation breaks down in case of crushing, slicing, piercing (kittens are even worse than cats in this regard) or simply worn out due to repetitive bending in the same spot.
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