Summary: I would have given the product five stars if the price was cheaper. I cannot comment on all of the features because I do not use all of them. However, I will say that I am definitely satisfied with the unit.
Summary: I nice improvement over the previous model. I especially like that ports are powered off when the primary device is turned off. The only thing it lacks is true sine wave output when on battery.
Summary: First, those who mention this is not 'Mac' friendly. This simply is not the case. I have been using this with my iMac and it works fine. "Powerchute" is not needed. You plug included USB cable from the Backup to the computer. You go to Power Management settings on your Mac. UPS will be in the options and you can make all the sleep/standby/shut down after such and such a time from there. I've tested it, it works fine.
Summary: I was concerned that this wouldn't really be up to the task I have for it (UPS for a FluoroScan). The picture looked so much like the XS 1000s I have on the desktops here that I thought it would be a lightweight. It is much beefier than the XS1000 backup units. I've only had it up for a little while, but so far so good.
Summary: I just received this unit as a replacement for an aged Back-Ups XS1500. After installing the battery and plugging it in to the AC outlet I turned the unit on. After 60ish seconds the unit showed error code FO4. After subsequent tries I also received FO2 as well. So the unit did light up but I would consider it DOA. APC support is quite solid as always and they are shipping a new unit and shipping label for the return.
Summary: This UPS is replacing a similar one which failed unexpectedly after about 4 years of service. It has a slightly different profile (taller and thinner), which I find I don't like as much, and it has one fewer powered outlet, but 3 more unpowered ones, which is at best an even trade. I wish it were easier to fit more large plug outlets - there's only room for one on each side, IIRC. But otherwise, the UPS works exactly as expected.
Summary: Great UPS. Easy to set up and use. Powerful, easy to use operator interface. The only problem I have is that the display is unreadable once one is looking at it from much of an angle. My UPS is mounted 6' off of the floor and the display is totally unreadable when looking up at it. And this is disappointing since I would like to easily view the operating parameters the unit so nicely displays.
Summary: I have been using these for years and they last and work well. My only complaint is that I would like it to show amps used. You can add an additional battery to extend run time. I wish APC would make a 2000VA or higher capacity UPS.