@tenida,as far as i know only APC & numeric mention the actual wattage rating along with VA rating(360W/600VA etc).even microtek does not mention this so as far as efficiency is concerned except APC & numeric nothing can be said about other brands.as i earlier said experience can be the only indication here & intex is being successfully used by many here including myself.of course if one has the budget APC is the best choice.
P.S.i don't think UPS affects system life as much as PSU.even the crappy local no name brand ups in worst situation will simply shut down the system resulting in data corruption.
@tkin,i meant to say relative as in against absolute.i know intex headphones are crap but that does not mean intex ups are also crap.(coolermaster psu & cabinet).if intex ups fail me in future or others start posting their intex ups failures then i assure you i will not recommend intex ups to anyone but until that time i will recommend intex ups as a budget option.
Also APC has a better surge protector built inside, I have seen this first hand.
Once I had a power surge in my house, I have two UPS, APC powers system, and intex used to power Monitor, speakers, printers and everything else, when the surge hit, APC switched off(tripped internal circuit breaker), intex blew a fuse but killed my modem alongside it(fortunately monitor was a CRT one, which survived, so did the speakers, printer was turned off), now I have replaced Intex with microtek but I use Belkin surge protector to protect the Microtek UPS fro any further surges.