Quality does make a difference but consider the capabilities of your service, tv and other electronics.
A more expensive cable can accommodate up to 1080i, but even cox hd programming offers a small fraction of that quality. If your TV is only 720 then you won't need that upgrade. They are definitely better than using audio/video jacks but so are cheap hdmi cables- you also want to consider the rate of info being transferred, how fast the images move and how much colors are also being used. If you watch a local news broadcast in HD it won't make a difference, but if you watch live sports on HD, you will notice some differences.
I work in TV repair, and there is not that much of a difference. They are all consumable parts and they will fail after a given amount of time.
So as far as calling it quality, I hesitate. I prefer to call it temporarily luxurious, because today's tech is really lacking in quality.