Their 600 VA UPS, gives an output of only 250 VA, enough only to run a CPU. Their officials openly admit this value, but then give the explanation that 600 VA actually means 250 VA. As far as I know(as an engineer) , a 600 VA should give an output of 500 VA after taking into account all possible losses. The same problem happened with 3 other guys I know( so the grudge is not just 1 individualistic review)
My advice: Never ever buy a microtek UPS, they simply wont work on your computer( you might end up with a crashed hard disk instead).