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Let me be clear upfront: the Greenworks GPW1500 is not going to clean a concrete driveway that hasn't been touched in a decade. It's not going to strip paint or blast mud off a truck chassis. But at $99, it's not trying to do those things. It's trying to be the pressure washer you grab for light tasks that a garden hose just can't handle — and in that role, it's pretty good.
What it handles well: Washing a car (with the 40-degree nozzle), cleaning patio furniture, blasting mud off sidewalk cracks, rinsing garbage bins, and cleaning window screens. The 1500 PSI is about what you'd get from a high-pressure nozzle on a garden hose, but the 1.2 GPM gives you more volume to push dirt away. I cleaned a set of plastic resin patio chairs in about 10 minutes — the same job takes 30 minutes with a hose and scrub brush.
Where it falls short: Don't expect to clean concrete driveways, strip decks, or remove mildew from siding. The pressure just isn't there. I tried to clean a 10x10 patch of concrete with light moss growth — it took 20 minutes and still left visible stains. A 2000+ PSI unit would have done it in 5. The hose is only 20 feet, and the unit is light enough to carry, so you're moving it around a lot.
Bottom line: This is the pressure washer for apartment dwellers, small patio owners, or anyone who mainly needs to wash a car and some outdoor furniture. If your jobs are heavier than that, save up for the GPW2000 at $199, which doubles the cleaning power. But for $99, the GPW1500 is the best value in the entry-level class.