They're decent cables for sure.. there are situations where they might not work as good as Monster cables (very long runs for example), but it's worth going with them to save lots of $$.. And for digital signals if the cable isn't good enough it's very apparent unlike component cables.
http://gizmodo.com/gadgets/hdmi-cabl...iii-282725.php
If things keep going up with more resolution, colours, or frame rate then the cheaper ones may become less usable, but for now they're fine. And if that happens I'm sure the cheap ones will improve to keep pace with technology.