We use SmartPower, it is better than APC on filtering noise in situations where power isn't clean. We use to use APC. If all you need is battery backup and no surge supression, line filtering or voltage regulation then shop around, because you will pay extra for those features. SmartPower, APC, and PowerVAR are the top 3 to pick from. PowerVAR claims to be the best and they have a higher cost. Do your research and decide which one best solves the problem you are trying to overcome.