It is much much worse for computer parts. If it is something that is highly counterfeited, or something Amazon refuses to sell because they don't like the competition (ie. Apple products), it is totally buyer beware.

I've been burned by trying to buy a simple Apple charger on Amazon. Good luck getting a non-counterfeit version.

Frequently 3rd party sellers have much crappier versions of the standard item, or lacks a warranty or some such.

Make sure to look through *all* the sellers and find the Sold by Amazon price, and then you may have a chance, but just let them pick the "cheapest" 3rd party seller, and then its a total crap shoot.