Just some quick background before I get to our current situation. We're a small design studio in a rather old building. From the git-go we've had power issues - tripping breakers, power outages are frequent due to wind/weather - most every piece of hardware that we've had problems with has ultimately been power related - mostly with power supply issues and dead a/c cords with bad transformer boxes. We have four Mac Pro workstations - they each have their own APC/Back-UPS 750. We consistently have to replace these (usually under warranty), usually due to some power issue zapping the Back-UPS. Currently we have two Back-UPS that have dead outlets - likely due to a power outage/spike over the weekend. We also lost a Cinema Display as a result, also connected to one of the Back-UPS. So I'm looking to replace those compromised units. I can get these replaced through the warranty - but I'm wondering if we need to switch to Back-UPS PROs equipment. I've been trying to discern the primary difference between the two - looks like the PROs offer Automatic Voltage Regulation. Does anyone have any experience with these units? Or a similar situation? What do you use for power management/battery backup? Particularly in the case of an old building with fluctuating power issues? Any advice is appreciated. Thanks.