I was talking specifically about the USB adaptor. Having to pay the extra bucks but still not being able to get full potential performance is not worth the price and effort.
If they provide an interface which makes full use of the PCI-E bus with minimum bottleneck then its good.
Even then, the extra components needed to carry around defeat the purpose of a gaming laptop i.e. portability.
EDIT: My bad!!

It does have a PCI-E interface.
Still looking at the product reviews, many people faced problems with it. Also that is not available here in India yet. So yes, they are still not worth it.
