Yeah, Brother laser printers are total workhorses in my experience, and cheap as hell to run.
The one I currently have set me back a whopping $125 or so, does duplex printing and has wifi. Looking at my printer stats page, it's jammed a grand total of twelve times out of nearly 13,000 prints. And that's using the most basic paper I can get my hands on.
Got curious about my total cost/page just now. Looking at my status page, I see I've replaced the drum once ($75) and used 5 toner packs (average let's say $45 each). Add in paper (26 reams @ let's say $5 each) and I get a grand total of $430 for consumables, plus the cost of the printer itself (let's call that $125) -- now I'm up to $555. Divide that by the 12,789 pages I've printed and I get about 4.3¢/page, not including electricity. Not bad!
I can't speak to the scanner situation, but I did buy my mom one of the Brother B&W laser all-in-ones with a scanner/fax/printer. The printer part looks pretty much the same as mine, and the whole unit seems to be running quite nicely. The few times I've used the scanner and document feeder, it's worked fine. But that's all very light usage.
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I think that all starts to break down once your volume goes up. No matter how quick you are with your phone, if you have a 10-page document you want scanned, dropping it into the document feeder of a decent scanner is far, far easier than lining up each page and going through whatever workflow your scanning software has.
So I'd agree that for occasional light scanning a phone is a great solution, but there's an inflection point at which it starts to be too slow.