from experience. buy an APC. don't buy from anyone else. it fails, (it can happen), within 24hours there will be a brand new one at your home/workplace, shipping free. you pack up the failed one in the same box and send it back. (again, shipping free). I was in a building that was hit by lightning. the phone system blew out, 4 computers, the light circuit and the only thing that saved the servers? our APC. on the power chart, you could see when the bolt hit a spike that went straight off the screen. the APC absorbed it and kept on going for another month before it failed. this is one company I trust !