I have had this uninterruptible power supply (UPS) for a year now and feel that it deserves this feedback since it has proven to be very reliable. It has done everything it is supposed to do, i.e. kept my computer system operating normally after a number of power cuts giving me more than enough time to shut down without losing data or causing any malfunction. That is over 5 minutes in my case but that time will be more or less depending on how many peripherals you are powering (I have two external hard drives, an external speaker system and printer). If that is not long enough for you maybe a larger size UPS in the same range would be better for you.
The build quality is very good as you might expect considering APC provides a two year warranty period which includes an additional comprehensive insurance policy against losses caused through any malfunction of the UPS. When there is a power cut it seamlessly continues supplying 230V from its battery, giving warning bleeps to alert you if you are in another room.
I have contacted the manufacturer via email for information a couple of times and they have responded almost immediately with full answers through their system of customer support which I have found to be excellent.
The software package (PowerChute) that comes on a CD provides a number of monitoring and setting options that will suit most users.
It may not be the cheapest UPS out there but I would say it is one of the very best for the price, and when it comes to price, cheapest is not always the most reliable, which I have found this UPS to be.