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FWIW my experience with CyberPower UPSes has been excellent; the first PFCLCD1500 I bought went ten years before it blew an IC. Customers are thrilled with them. APC is a speck in the rear view mirror but a Tripp-Lite double conversion unit is likely my next upgrade. Remember ... all line-interactive power supplies have limitations, and a little $40 750VA battery box is no less prone to defects than any other.
In a pinch, I once ran my trailer's lights, furnace blower, and water pump -- sparingly -- through a cold winter night, on that first 1500VA unit. It had no trouble turning that water pump to full pressure even halfway through discharge. Really respectable performance.