I received the sprayer and tested it with water first.
First thing to note is that the instructions are basic, but if you have any experience with electronics or power tools, it should be pretty simple to figure out. All the parts are easy to disassemble for cleaning.
Testing with water, you really notice the difference between the different sized nozzles. I'd say with water, the 1.5 is a good size to start with. I'll start here with latex paint and move up if needed. The volume adjustment also works, it's not a fancy control, but a simple screw that controls how much the trigger depresses. Sometimes the simple solution is the best solution and the volume control is exactly this.
Testing with water, I could get good coverage at about 18 inches. The spray is not precise so any real painting will require proper prep and masking. Getting good coverage of about 36 sqft used half a container of water. I expect to have to refill often, but the trade off between weight and coverage is reasonable.
I can't wait to use it to paint my hallway, kitchen, bathroom and laundry room. If performance with paint is different, I'll come back to update the review.