I have mine rigged up with Gaia which is a topographical map application. I can import KML overlays which allows me to georeference my collection of historic topo maps (1890-1940). I can use to walk old homesteads in real-time and find the sites of houses that haven't stood for over 100 years. I can do the same thing with a laptop, but the applications cost like 5x more and the laptop weighs more and runs down a lot faster. Why do this? I metal detect and this allows me to get on target quickly.
I do quite a bit of non-digital art. Using Sketchbook, I can arrange masses, block them in with color, and decide if I like a composition before picking up watercolors or pastels. It is especially nice with landscape references as you can quickly simplify and modify the masses. You might consider it a luxury, but it saves me the cost of watercolor paper or sanded pastel paper and if you knew the cost of that stuff, you would do what you could to keep from wasting it.
Other than that, I am using it as a reading device. I am trying to teach myself java and it is really handy to be able to read a PDF like a zoomable book while not ALT-tabbing around.
Luxury uses - heck yeah, music, graphic novels, movies etc, but I am slowly applying it towards work. It is what you make of it.
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