there are MANY cable companies producing cable.
each one has a different design philosophy and there is a variation in the parameters that affect their performance.
many of the companies sell direct , while some have dealer networks.
i try to minimize risk. therefore, as has been suggested, if you can have a home audition of 30 days, it is worth a shot. you will pay for shipping of course.
if you buy blind, you will have a problem reselling the cables.
minimize risk i wouldn't buy the cable without a return policy. you can't quantify the odds that you will like the cables.