Can you use a Wagner Power Sprayer to do interior walls or is it outdoors use only?
It would make short work of my bedroom (I hate to paint!).
If you want the floors/walls/ceiling/doors/window glass/outlets/switches all the same color then I see no problem w/ it, but use a mask when you spray.
My husband used one to paint our son’s bedroom. We taped off all the parts (ceiling, built-in desk, et cetera) that we didn’t want to be the wall color, and it worked great.
In the time it will take to mask off eveything, you can finish the job woth brush and roller.
Correction: In the time it takes him to finish posting to and reading this thread…
Plus, you’ll get much better coverage. If at all possible, I try to avoid spraying walls and cielings. Woodwork, sure, but a better job is done with a brush and roller on walls than with a sprayer, even by experienced painters.
There are exceptions, of course. Like in restaurants requiring an epoxy to applied to all wll surfaces in food prep areas (as opposed to simply installing FRP).
But, when you consider the amount of thinning that has to be done to get a latex paint to flow evenly thru a spray rig, and the coverage problems this causes, plus the runs, improper overlap, etc… Seriously, if you just move the stuff away from the walls so you’ve room to move around (which you would have to do to spray anyways), then just get in there with a brush to cut in and roll right after that. Easier, cleaner, superior job.
Of course, someone else will be in to show that I’m wrong. This is the Dope, after all. 
Beyond this, I have read nothing but bad things on epinions about the wagner power paint sprayers. I’d avoid them, and avoid spraying indoors.
Definitely don’t use the sprayer, but I wholeheartedly recommend their power roller. I heart my Wagner Power Roller. It even has a guard to keep idiots like me from painting the ceiling.
I didn’t think it was a good idea, but nobody could ever give me a legitimate reason (paint all over the place).
This will give me incentive to perfect the Paint Grenade.
When a homeowning n00b, I tried a Wagner Power Sprayer. I spent more time thinning paint, cleaning the damn thing out, masking, etc. than it’s worth. I tried a Power Roller also and found the results to be similar. For one or two rooms, they don’t have the benefit in time offset.
Now that I’m a contractor, I have a high capacity airless rig that will work from a 5 gallon bucket of unthinned paint, as well as a compressor and pressure pot to which an automotive quality handpiece is fitted. Superb in quality, but I still need several thousand square feet of the same color and gloss before the setup/breakdown/cleaning/masking time is offset by the time saved in application. Also, Joe Homeowner isn’t ready to drop that kind of $ on equipment.