On paper, I'll agree, the HP specs are nice. But in reality, you will open the device and be greeted by a ton of pre-installed garbage apps and programs, which will suck away the performance for very questionable gains, if any. Microsoft doesn't add junk-ware, so the Surface comes out of the box ready to run at 100%.
In any case, neither device is good for gaming, and I'd argue that the Surface is "good enough".
And if you have a problem, have fun with HP, while you can take a Surface to any Microsoft store and get immediate help.
The above link bares this out- check the customer rating and satisfaction for the HP vs Surface 3, the results speak volumes.
Of course, YMMV. I don't think this is a bad deal, I just think at $100 off the Surface 3 is a superior value. If you don't mind reinstalling windows and drivers to clear out all the HP crapware, and don't mind gambling with HP service/support, buying this tablet might make a lot of sense.