Found another option to Dewalt for $160 from Worx.
Nitro 20V Brushless Hydroshot Plus Portable Power Cleaner (710 MAX PSI)
www.worx.com
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My experience with Worx products are that they SEEM like DeWalt's younger red-headed stepchild. They've had some absolutely great products, and then it's dropped from their line after crazy short time periods. I bought their corded turbine blower, and it's absolutely awesome. I like it even better than my DeWalt 20v blower. They have a cordless version too, but it supposedly suffered from terrible battery life, and unlike DeWalt, Milwaukee, and other top-shelf brands, they don't seem to have decent sales on their replacement batteries. That's why I went with the corded version.
That blower came with a "gutter attachment" so you could blow out your gutters from the ground, and that thing quickly became rarer than hen's teeth. WTF?!? The other drawback is that their products never seemed as robust, even when the specs claim similar performance.
I have no experience with that product you're showing, but I would strongly lean towards the DeWalt. Our service techs at work all use the DeWalt, and while the pressure isn't the same as a gas or electric pressure washer, it works for cleaning vent hoods, oil buildup, etc. This is always in conjunction with powerful chemicals, so the bulk of the work is being done by that, while the DeWalt is simply helping with some removal, and getting the chemicals off after they've done their magic.
710 psi - MAX, is not a lot. Low-powered electrics still kick out 1300-1500 PSI. It's DEFINITELY spec'd as more powerful than the DeWalt, but the DeWalt is going to have better support and longevity of their product line.
For a similar price, check this one out from Amazon. It runs on DeWalt's 20v batteries, and it's supposedly claimed to be even more powerful than the Worx. Although the Chinese knock-offs like that tend to overpromise on their performance, it should at least be more powerful than the Worx, for the same money.
It says it's "electric", yet it's battery powered, and you should be able to upgrade the hose and gun with even better replacements. If you've got DeWalt batteries, it's ready to go, otherwise you can buy batteries at any brick and mortar, or get some knock-offs from Amazon if you're looking to just test it out at first.
Not trying to shoot down your idea, just giving my experience with Worx products. I'd still buy some of their stuff, but I prefer their corded stuff over their cordless - those batteries tend to not be as robust, and their corded stuff has proven to me to be more powerful and less problematic.