No one's going to be running an A/C or refrigerator off of a 1000VA battery backup. Not only would it only last a few minutes, the compressor starting up would be too much amperage and it would cut out immediately. Sine wave used to be important for PC power supplies a couple decades ago. Power supplies are built much better nowadays and aren't effected by simulated sine wave. The only things someone might need a pure sine wave UPS for these days are sensitive medical equipment, like CPAP machines, etc. The audiophile community likes to spend money on pure sine wave UPS's and power conditioners, but they've been proven redundant many times, as any decent amplifier already has power conditioning built-in.

The answer is a somewhat annoying "it depends," but generally speaking, yeah, it should be totally fine for any modern desktop computer power supply. No power supply provides AC mains power to the parts; they convert it converts it to DC. In so doing, they have systems for power filtration built in, because the power coming from the grid is never (okay, rarely) 100% perfect.

The primary drawbacks in reality are that the PSU may run less efficiently and generate somewhat more heat. However, in a situation where you'd want a relatively low-capacity UPS like this, it's probably to have time to save your work and shut down or you expect the power will come back in <5min, in which case the efficiency loss is likely to make a big difference.

In other words: I'd be more worried about a power surge or sudden loss of power causing damage to your computer than I would be about a simulated sine wave.

That said: this does not extend to all devices! If you're thinking of putting HiFi audio equipment, machinery, medical devices, or, like, a PDP-11 behind a simulated sine wave UPS: don't.

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