They're not good bindings, but if you are not having problems with them pre-releasing, and they are not breaking on you, then I think you should just keep using them because they might be just fine for you...
If you're having problems with them pre-releasing with the din cranked up, or if you have the toe or heel piece rip off / explode then you might be too strong of a skier and you may want to consider spending more money on some burly bindings.