Summary: I ordered three of these units. The cable that must be connected to the battery is very, very difficult to connect. The cable is too short, is rotated, and the clamp is too tight to fit onto the receiver without prying it loose a little. There is not room enough for your fingers to function. I have had APC UPSs before and the cable was long enough, in proper alignment, and a proper tightness for the receptacle. I consider this to be a design flaw.
Summary: I had bought this unit in 2008. I have had absolutely NO problems with it, I have not yet needed to change the original battery. Has worked seamlessly with all versions of OSX from Lion to Mavericks. Easily supported and monitored by USB cable, Mac OS automatically recognizes it and the settings (if you want to adjust them) are VERY easy to use and with no other software needed. Runs very quiet and barely hear it running.
Summary: The item arrived in a timely manner. It was well packaged. It was easy to setup and put to use. However, only time will tell if I end up happy with the product. Maybe you should ask me again in a year or two.
Summary: Best choice for the size (biggest with no fans), no fans (silent), battery backed-up ( battery warranty is 3 years and it lasted the double, so far), very useful, support from APC is excellent.
Summary: I have two units, one for a Mac and one for a PC. I wish there was a Mac version of the PowerChute software. It looks and works great on my PC, when comparing the information I can obtain from Energy Saver on the Mac. Will there be a Mac version soon? I can't believe there isn't already a Mac version.